Symptoms10 October 2026 · 19 min read

Does ADHD get worse with age, go away or start late?

Does ADHD get worse with age, go away or start in adulthood? What UK health bodies say, what long-term studies found, and where the evidence runs out.

Written and maintained by the ADHD Private editorial team, drawing on the sources listed at the end of this article. This is general information, not medical advice.

At a glance

63.8%of 558 children with combined-type ADHD in the Multimodal Treatment Study of ADHD (MTA), a treatment trial in the US and Canada, had fluctuating periods of remission and recurrence over up to eight assessments, to an average age of about 25Fluctuating means at least two changes between persistent ADHD, partial remission and full remission, without recovery. Only 9.1% met the study’s definition of recovery: full remission (symptoms below its threshold by every informant, no clinically significant impairment from ADHD symptoms, no ADHD treatment for at least a month) at two or more assessments in a row, lasting to the end of the study. The 558 are those analysed of the 579 children recruited at ages 7 to 9 to a 14-month treatment trial. One study of one group of children, not anyone’s chances; the authors say they “cannot draw definite conclusions about the causes of remission”. Sibley and colleagues (2022); authors’ manuscript.Sibley et al. (2022), American Journal of Psychiatry: Variable patterns of remission from ADHD in the MTA (authors’ manuscript) (10 October 2026)
25.0%of adults aged 16 to 24 in households in England screened positive for ADHD on a six-item self-report screen about the past six months, against 3.7% of those aged 75 and over (different people at each age)Different people at different ages, surveyed between March 2023 and July 2024, so it does not show how anyone’s ADHD changes. A positive screen “does not mean that someone has the condition”, and prevalence “is likely to be considerably lower”. 13.9% of all adults screened positive. NHS England, Adult Psychiatric Morbidity Survey 2023/4.NHS England: Adult Psychiatric Morbidity Survey 2023/4, chapter 9, ADHD (10 October 2026)
0.05%of people aged 65 and over in a sample of English GP records (CPRD Aurum) had at least one ADHD diagnosis code or ADHD-medication prescription code, as at 30 June 2025, for each sexAged 18 to 24 the figure was 3.60% of males and 2.07% of females. A different measure from the survey screen in the previous tile, so the two are not comparable. Recorded codes, not a count of everyone with ADHD: the authors say recorded rates are “substantially lower than published estimates of ADHD prevalence, particularly in older age, suggesting potential under-recognition”. John and colleagues (2026).John et al. (2026), Lancet Regional Health Europe: ADHD in children and adults in England, 2000 to 2025 (full text) (10 October 2026)

The short answers

There is no single answer. NHS inform and the Royal College of Psychiatrists say ADHD’s challenges usually begin in childhood and, for most people, continue as they grow up, though they may change or improve. In three studies we read that tracked the same people’s symptoms over years, average scores fell on most measures; in one, some people’s rose. How many children still meet the criteria as adults depends on how that is defined, and whether ADHD can begin in adulthood is debated.

It is general information, not medical advice. If someone’s life is at risk, call 999 or go to A&E. Other urgent help is listed near the end.

Question	What the sources we read say
Does ADHD go away?	For most people the challenges continue as they grow up, though they may change or improve (NHS inform; Royal College of Psychiatrists). How many children stop meeting the criteria depends on what each study counted.
Does ADHD get worse with age?	None of the NHS, NHS inform, NHS 111 Wales, nidirect or NICE ADHD pages we searched on 10 October 2026 says so. The Royal College says rising stress “can mean that their ADHD causes more challenges as they get older”. In three follow-up studies we read, average scores fell on most measures; in one, some people’s rose.
Can ADHD start late?	Both diagnostic manuals look for symptoms before 12. Some studies found young adults with ADHD and no childhood diagnosis; reviewers point to earlier or milder symptoms, onset in the teens, and conditions that look like ADHD. Whether ADHD can begin in adulthood is debated.

Does ADHD go away?

NHS inform (Scotland) says: “For most people with ADHD, these challenges usually begin in childhood and continue as they grow up, though they may change or improve.” The Royal College of Psychiatrists says much the same, and NICE, whose guidelines cover England and Wales, says “ADHD may persist into adult life.” nidirect’s ADHD page, which is about school-age children, says: “The symptoms of ADHD usually improve with age, but many adults who are diagnosed with the condition at a young age will continue to experience problems.”

Follow-up studies of children diagnosed with ADHD “report widely ranging ADHD persistence rates in adulthood (5-75%)”, the team of the Multimodal Treatment Study of ADHD (the MTA) wrote in 2017. Pooling earlier follow-up studies in 2006, Faraone and colleagues wrote in their abstract that “estimates of ADHD’s persistence rely heavily on how one defines persistence”, but that “regardless of definition”, evidence for ADHD “lessens with age”. More work was needed, they said, to tell whether this reflects “true remission” or “the developmental insensitivity of diagnostic criteria”.

In one study, the MTA, 558 of the 579 children with the combined type, aged 7 to 9 when recruited to a 14-month treatment trial in the US and Canada (reported in 1999), were assessed up to eight times, to an average age of about 25 (Sibley and colleagues, 2022).

The study counted full remission as symptoms below its threshold by every informant, no clinically significant impairment from ADHD symptoms and no ADHD treatment for at least a month, and recovery as full remission at two or more assessments in a row, lasting to the end of the study. 9.1% met that recovery definition, while 63.8% “had fluctuating periods of remission and recurrence over time”, changing at least twice between persistent ADHD (still meeting the study’s symptom and impairment thresholds), partial remission (neither persistent nor fully remitted) and full remission.

These are figures for one group, not anyone’s chances. The MTA authors say that, because their study was observational, “we cannot draw definite conclusions about the causes of remission”, and that their findings “challenge the notion that approximately 50% of children with ADHD outgrow the disorder by adulthood”.

The kind of symptoms can change. The Royal College says hyperactive and impulsive symptoms “tend to be more common in childhood and be less of a challenge for some people over time”, while inattentive symptoms “tend to become more of an issue in teenage years and adulthood”. WHO’s clinical descriptions for ICD-11 say that although hyperactivity becomes “less overt”, people “may still experience difficulties with inattention, impulsivity and restlessness”.

For parents, the Royal College says: “ADHD is not something that disappears as people grow up. However, it can become less noticeable with some people experiencing fewer symptoms as they get older.” Some young people “struggle more as they get older, as they receive less support from family.”

Does ADHD get worse with age?

On 10 October 2026 we searched the NHS website’s ADHD pages for adults and for children, the NHS inform and NHS 111 Wales adult pages, nidirect’s ADHD page and three chapters of NICE’s ADHD guideline for “worse” and “worsen”. None says ADHD gets worse with age; where the words appear, they are about other things.

The Royal College of Psychiatrists says that in adulthood “new challenges like parenthood might further increase a person’s overall level of stress. This can mean that their ADHD causes more challenges as they get older.” As demand and stress rise, people with ADHD are “more likely to struggle to keep up”, it says, and can become “overwhelmed and unwell”, which “can be avoided through appropriate support”. See our guide to ADHD burnout.

WHO’s clinical descriptions say adolescents and adults may only seek help after 12, “once symptoms become more limiting with increasing social, emotional and academic demands”, or when a developing mental, behavioural or neurodevelopmental condition “results in an exacerbation” of ADHD symptoms.

Three studies we read that measured the same people more than once found average scores fell on most measures, with caveats:

Karam and colleagues (2017), based at an ADHD outpatient clinic in Porto Alegre, Brazil, followed a clinical sample of 344 adults with ADHD for seven years (66.0% stayed). The abstract gives neither their ages nor the dates. It reports that “On average, symptoms declined in all ADHD domains”, but that “a rise in the symptoms after 7 years was not uncommon”.
Henning and colleagues (2024) had 320 of 2,629 university students in Ontario, Canada, not selected for ADHD, rate their own symptoms in 2000 to 2002, at about 20, and again about 15 years later. The 15-year test-retest correlations for the total ADHD scale were “moderate” (r = .44 for men and .46 for women: those who scored higher at about 20 tended to score higher 15 years later), but “ADHD symptoms did decrease over the 15-year period”. The self-reports were not corroborated.
Wootton and colleagues (2022), combining five general-population cohorts in the UK, New Zealand and Brazil (born 1972 to 1996; ages 3 to 45), report that “ADHD trait scores declined from childhood to mid-life, with marked variation between cohorts”. These are trait scores, not diagnoses; only the New Zealand cohort went beyond the late 20s; and the authors cannot rule out that people dropping out explains part of the decline.

Other things can make symptoms worse. The NHS says “Anxiety and depression can make your ADHD symptoms worse”, and the Royal College says “Not sleeping well can make ADHD symptoms worse.” See our guides to ADHD and anxiety and ADHD and sleep.

Can ADHD start late, or is it found late?

Each body words onset differently:

Body	What it says
American Psychiatric Association: DSM-5 fact sheet (2013)	“several of the individual’s ADHD symptoms must be present prior to age 12 years”
WHO: ICD-11 (2026 release)	Symptoms “prior to age 12, though some individuals may first come to clinical attention later in adolescence or as adults, often when demands exceed the individual’s capacity to compensate for limitations”
WHO: clinical descriptions for ICD-11 (2024)	In adults, a history of symptoms before 12 “is an important corroborating feature”; without such information, a diagnosis in older adolescents and adults “should be made with caution”.
NICE NG87 (England and Wales)	Context: “Symptoms should be evident in early life, if only in retrospect; for ICD-10, by age 7 years and for DSM-5, by age 12 years.” Recommendation 1.3.3: symptoms should meet the DSM-5 or ICD-11 criteria, “but exclusion based on a pervasive developmental disorder or an uncertain time of onset is not recommended”.
NHS website (England)	“These symptoms usually start before the age of 12.”

WHO describes people first seen in adulthood: “Some individuals with attention deficit hyperactivity disorder may first present for services in adulthood.” Whether ADHD can begin after childhood, rather than be noticed then, is a separate question, and researchers disagree.

Five long-term studies of children not selected for ADHD looked for ADHD, or high ADHD scores, absent in childhood. Each found some and names limits. Four stopped between 17 and the mid-to-late 20s; Dunedin went to 38.

Study	Who, and when assessed	What it found	Some limits the authors name
Moffitt and colleagues (2015), Dunedin, New Zealand	1,037 people born in 1972 and 1973, followed to 38 (95% retained); childhood ADHD by DSM-III criteria at 11, 13 and 15; adult ADHD at 38 by DSM-5 criteria apart from onset age and cross-setting corroboration	Childhood ADHD 6%, adult ADHD 3%. “90% of adult ADHD cases lacked a history of childhood ADHD.” The findings “raise the possibility that adults presenting with the ADHD symptom picture may not have a childhood-onset neurodevelopmental disorder.”	Their manuscript says “replication in other cohorts is imperative” and that the study “did not assess ADHD during the participants’ twenties”.
Agnew-Blais and colleagues (2016), E-Risk, England and Wales	2,232 twins born in 1994 and 1995 (2,040 analysed); childhood ADHD by DSM-IV criteria from mothers’ and teachers’ reports at 5, 7, 10 and 12; adult ADHD by DSM-5 criteria from a private interview at 18	“Among 166 individuals with adult ADHD, 112 (67.5%) did not meet criteria for ADHD at any assessment in childhood.” At 18 they had comparable symptoms and impairment to the persistent group.	Diagnosis at 18 “was based only on self-reports”, though co-informants’ ratings supported them; the study “may include false positives”, though the authors cite evidence that their groups were valid. “Late-onset” meant the full syndrome began late; over 85% of the whole sample had some childhood symptoms.
Caye and colleagues (2016), Pelotas, Brazil	5,249 people born in 1993: a parent questionnaire at 11, calibrated against clinical interviews; DSM-5 criteria except age at onset, by self-report, at 18 to 19 (81.3% retained)	“only 60 young adults (12.6%) with ADHD had the disorder in childhood”. The authors “suggest the existence of 2 syndromes that have distinct developmental trajectories”, adding: “This finding would not mean that ADHD could not be conceptualized as a neurodevelopmental disorder.”	They call their childhood rate of about 8.9% “notably inflated” (though similar to a prevalence study that also used a screening instrument), and link their adult rate of 12.2% to the DSM-5’s lower symptom cut-off and to not requiring childhood onset.
Cooper and colleagues (2018), ALSPAC, Avon, England	Children due to be born from April 1991 to December 1992; parent-rated questionnaire scores (not diagnoses) at 12 and 17, checked against scores at 7, 8 and 9	Of 75 with a high score (8 or more out of 10) at 17 but not at 12, and enough earlier data, 56 (75%) had a raised score (6 or more) at least once from 7 to 12, “suggesting that they may have been misclassified”.	“the small size of the genuine late-onset group”: the 19 with close-to-average scores at 7, 8, 9 and 12
Sibley and colleagues (2018), the MTA’s comparison group	239 classmates without childhood ADHD (of the 289 recruited at the MTA’s two-year follow-up), assessed up to eight times from about 10 to about 24	“Approximately 95% of individuals who initially screened positive on symptom checklists were excluded from late-onset ADHD diagnosis” (meeting full criteria later, once other causes were ruled out). “Most late-onset cases displayed onset in adolescence and an adolescence-limited presentation.” Of the 239, “only 2 (0.8%) showed evidence of adult-onset ADHD”; both “possessed a variety of past or current mental health symptoms”, and “it was difficult to disentangle the etiology of these individuals’ symptoms”.	Their manuscript: “We assessed cases only to the mid-to-late 20s. New late-onset cases might appear later in development.”

What reviewers say:

Asherson and Agnew-Blais (2019): the abstract reports that “the current studies suggest that most (but not all) cases of late-onset ADHD” (ADHD in young adults who would not have met full criteria as children) “develop the disorder between the ages of 12-16”, adds that “There is a relative lack of data spanning young to older adulthood”, and says “significantly impairing forms of ADHD can emerge beyond the age of 12 years, although perhaps rarely in the context of a complete absence of precursors”.
Franke and colleagues (2018) call the idea that ADHD arises “de novo” in adulthood, other than after a brain injury, “controversial”, and the conclusions of the Dunedin, Pelotas and E-Risk authors “premature”. They write: “Other forms of apparent adult-onset ADHD may exist, but many of these are likely to have had undiagnosed ADHD or subthreshold ADHD in youth.”
Taylor and colleagues (2022): the abstract reports that nine studies met their criteria and says “Results suggest that the methodologies of the extant studies were not strong enough to evaluate adult-onset ADHD”. Late symptoms “seem to exist”, it says, but could be “adult-emergent symptoms that were previously surpassed due to lower environmental demands/supportive facilitators”, “mimics that were not properly assessed”, or childhood symptoms that had not come to clinical attention.

At an NHS assessment in England, the specialist will ask about the history of your symptoms, “particularly if they started when you were a child”, and may want to contact someone who knows you well. NICE says diagnosis follows a full assessment that includes “a full developmental and psychiatric history”.

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ADHD in later life: how much is known

Reviewers say little is known about ADHD in older adults. Franke and colleagues call old age “the current blind spot of ADHD research”, and Dobrosavljevic, Larsson and Cortese (2023) write in their abstract of “a striking knowledge gap on ADHD in older adults”.

Two sources from England compare age groups at one point in time:

The Adult Psychiatric Morbidity Survey 2023/4 (adults in households in England, March 2023 to July 2024) used a six-item self-report screen about the past six months: 13.9% screened positive (a score of four or more), highest at 16 to 24 (25.0%) and lowest at 75 and over (3.7%). Screening positive “does not mean that someone has the condition”, and ADHD prevalence “is likely to be considerably lower than the proportion screening positive”.
John and colleagues (2026) counted people in a sample of English GP records (3,536,476 people at 298 practices on 30 June 2025) with at least one ADHD diagnosis code or a prescription code for an ADHD medication: 1.19% overall, 3.60% of males and 2.07% of females aged 18 to 24, and 0.05% of each sex aged 65 and over. They write that recorded rates are “substantially lower than published estimates of ADHD prevalence, particularly in older age, suggesting potential under-recognition”.

Both are snapshots of different people at different ages, so neither shows how one person’s ADHD changes with age.

If you keep having problems with your memory, the NHS says to see a GP: “It could be caused by something that can be treated.”

When something else could be going on

The NHS says a GP may “consider other conditions that could be causing your symptoms, such as autism, Tourette’s or anxiety”. A 2026 review by Cuomo and colleagues (abstract) says: “Mood, anxiety, substance-use, sleep, stress-related, and personality conditions can overlap with or mimic ADHD-like symptoms.” See also our guide to ADHD and menopause.

If you think it may be ADHD: the route in each nation

Nation	What the pages we read on 10 October 2026 say
England	The NHS: “If your ADHD symptoms are affecting your studies, work or relationships, make an appointment with a GP to find out what support is available.” The GP “may decide to refer you for an assessment with a mental health professional specialising in ADHD”.
Wales	NHS 111 Wales repeats the GP wording, adapted from the NHS website for England. Senedd Research (July 2026) says there is no consistent offer across Wales for adults with neurodevelopmental conditions other than autism, though “some health boards do provide dedicated services for conditions (such as ADHD)”.
Scotland	NHS inform: “Speak to your GP practice if you think that you may have ADHD and it’s having a negative effect on your life.” “In Scotland, there’s no standard approach to assess ADHD.” It depends on your health board area.
Northern Ireland	nidirect’s ADHD page is about school-age children, and a search of nidirect for “ADHD” (11 results) found no page on how an adult is assessed. The Department of Health wrote on 30 June 2026 that “there is no regionally commissioned ADHD Assessment pathway”, and suggested contacting the Health and Social Care Trusts for more information.

In England, Right to Choose is one NHS route. The NHS says: “You can ask for an NHS appointment at any clinic, including a private clinic, if it provides ADHD services for the NHS in England.” It starts with a referral: NHS England’s patient choice guidance says, “The legal rights do not extend to self-referrals or any referral other than from or on behalf of a GP, Dentist, or Optometrist.” Our Right to Choose guide explains the steps.

Getting urgent help

We read each service’s page on 10 October 2026:

Anywhere in the UK: call 999 or go to A&E if someone’s life is at risk.
England: use 111 online or call 111 and select the mental health option, or ask for an urgent GP appointment.
Wales: call 111 and press option 2: for all ages, 24 hours a day, 7 days a week, and free from a landline or mobile, the Welsh Government says.
Scotland: NHS inform says your GP practice is the first place to go if it is open; if you can’t wait for it to reopen, phone NHS 24 on 111 and choose the mental health option. At busy times it “might take a little longer” to answer, “but please hold on because we will answer.”
Northern Ireland: call Lifeline on 0808 808 8000. nidirect says Lifeline is “confidential, free and open 24 hours every day”.
Anywhere in the UK: call Samaritans on 116 123, free from any phone, at any time.
Under 19: the NHS website (England) and nidirect (Northern Ireland) both give 0800 1111 for Childline.

The NHS website says a mental health emergency should be taken as seriously as a physical one: “You will not be wasting anyone’s time.”

Finding a clinic

Our directory’s page for adults lists private ADHD clinics that assess adults; for a child, see our children’s clinics page. In Scotland, NHS inform says to check first that your health board and GP practice will accept an assessment from another provider.

Sources

Sources checked on 10 October 2026.

Cite this page: ADHD Private (2026). “Does ADHD get worse with age, go away or start late?”. adhdprivate.co.uk, published 10 October 2026. https://adhdprivate.co.uk/symptoms/does-adhd-get-worse-with-age