At EACD Galway 2026, a longitudinal dataset from Queen’s University Belfast stopped me. Researchers had followed 233 people with cerebral palsy across three life stages — childhood (ages 8–12), adolescence (ages 13–18), and adulthood (24+). The participation numbers were stark:
| Life stage | Participation frequency score |
|---|---|
| Childhood (8–12) | 53 |
| Adolescence (13–18) | 39 |
| Adulthood (24+) | 69 |
Cooper et al., Queen’s University Belfast, EACD 2026
Health-related quality of life, psychological wellbeing, and social quality of life all reached their lowest point in adolescence — then recovered significantly in adulthood. Adolescence wasn’t a plateau. It was a dip. A measurable, reproducible dip.
A separate Irish national survey found that mental and emotional wellbeing was the top priority concern for parents of children with cerebral palsy — ahead of mobility, communication, or physical function — across every level of functional ability.
“The system around our children is calibrated for childhood. It peaks just before it’s needed most, then retreats.”
This is not a cerebral palsy story
The EACD data gave us numbers for one diagnostic group. But the pattern it describes is consistent across populations, conditions, and countries.
In the general adolescent population: A three-year Australian longitudinal study of 403 secondary school students found psychological wellbeing was considerably lower than European norms even among typically developing adolescents. The dip is a baseline condition. Disability amplifies it. (Meade & Dowswell, Western Sydney University, 2016)
Across physical disabilities broadly: A 2022 scoping review of adolescents and young adults with childhood-onset physical disabilities — covering CP, spina bifida, juvenile arthritis, and others — found depression and mood difficulties were the most commonly investigated mental health problem (73% of studies), followed by anxiety (39%). Rates varied widely, but the direction was consistent: this population is more vulnerable, and least served, during adolescence. (McMorris et al., Frontiers in Rehabilitation Sciences, 2022)
In autism: A US longitudinal study documented not only the post-high school “service cliff” but found that loss of services begins long before high school exit. Nearly 40% of young people with ASD received none of the key services — speech therapy, mental health, case management — after high school. (Shattuck et al. / Anderson et al., PMC, 2019)
In the adult CP population: Adults with CP have significantly elevated rates of mood disorders (19.5% vs 8.1% in the general population), anxiety disorders (19.5% vs 11.1%), and schizophrenic disorders (2.8% vs 0.7%). A separate clinical study found 39% of adults with CP met criteria for anxiety disorder, and 31% for major depression. (Whitney & Peterson, University of Michigan, 2019; Ryan et al., 2019)
The adolescence dip isn’t where the mental health story ends. It’s where it begins.
The structural failure
The timing of the dip is not coincidental. It maps almost perfectly onto the architecture of service withdrawal.
Children with disabilities are typically surrounded by coordinated support: paediatric specialists, school-based therapy, early intervention programmes, family support structures, review appointments. Then adolescence begins.
Childhood services end or reduce. Adult services haven’t started. Schools shift from nurturing to navigating. Bodies change in ways therapy didn’t prepare for. Social stakes rise. And the infrastructure that surrounded the child quietly retreats.
UK research on adolescents leaving mental health services describes the age-18 cutoff as an “artificial boundary” — a system that is “weakest where it needs to be strongest.” A qualitative study of young people falling through the transition gap found participants described their experience as: “I’m just a long history of people rejecting referrals.” (Appleton et al., European Child & Adolescent Psychiatry, 2020)
A Canadian study of transition-aged youth with neurodevelopmental disabilities described the same phenomenon as navigating a “support cliff” — a sharp decrease in service utilisation after reaching adulthood, driven not by improvement in need but by the disappearance of support infrastructure. (Frontiers in Public Health, 2025)
Critically, a longitudinal UK study (n=374) across CP, type 1 diabetes, and ASD found that most services do not deliver the features known to improve transition outcomes. The young people who fare worst are those without significant learning disability — the ones the system assumes can manage. For ambulant young people with physical disabilities, the assumption of competence becomes a mechanism of neglect. (Colver et al., BMJ Open, 2018)
“Without a single point of contact, families carry the coordination burden. Those with fewer resources are disproportionately disadvantaged.”
What makes adolescence uniquely dangerous
Adolescence is not just a service transition problem. It is also a biological window.
- 50% of all lifetime mental illness onsets by age 14
- 75% of lifetime mental disorders emerge before age 25
(Kessler et al., NCS Replication, 2005; World Mental Health Surveys)
Early adolescence (11–14 years) marks the period of highest incidence for anxiety disorders, mood disorders, and the emergence of subclinical symptoms that, left unaddressed, manifest as diagnosable conditions in adulthood. This is not a window that can be revisited.
For young people with physical disabilities, this developmental vulnerability intersects with reduced participation in the activities that build social identity and peer relationships, increased awareness of functional difference relative to peers, physical changes that can worsen spasticity, pain, and fatigue, and the simultaneous withdrawal of therapeutic scaffolding that supported earlier development.
The good news embedded in the EACD data: quality of life and participation do recover in adulthood. These young people are resilient. The system is not helping them be resilient — it is making resilience harder, and hoping they find it anyway.
What early-warning infrastructure could look like
There is no technological fix for a structural policy failure. But there is a gap infrastructure can occupy while policy catches up.
The core problem is detection and continuity. Mental health symptoms emerge gradually, often invisibly, at precisely the moment when the clinical review cadence is decreasing. By the time distress reaches a threshold that triggers a referral, it has often been present for months or years.
What would useful transition infrastructure look like?
- Longitudinal wellbeing tracking that travels with the young person through service transitions, not within a single service’s system
- Self-report mechanisms calibrated for adolescent communication styles, not proxy-report from parents or clinicians
- Participation monitoring that treats reduced engagement as a signal, not just a symptom
- Transition navigation tools that reduce the coordination burden on families — particularly those with fewer resources
- Peer connection infrastructure, given evidence that youth with disabilities who disengage from services often disengage from peer networks simultaneously
The research base is not thin. The gap is in translation: from what we know at the population level to what a specific young person and their family can act on in real time.
“The adolescence dip is predictable. That means it is preventable. Not by more clinical appointments, but by systems that don’t disappear.”
This Signal draws on data from EACD Galway 2026 and peer-reviewed research published 2015–2025. AXLab Signals are research synthesis for practitioners, policymakers, and families working in disability and rehabilitation.