ADHD and Later-Life Memory
Bauer-Negrini G, Leffa DT (co-first authors) et al., 2026, JAMA Psychiatry (published Oct 7) · "Attention-Deficit/Hyperactivity Disorder and Late-Life Cognitive Impairment"
DOI 10.1001/jamapsychiatry.2026.3165
Cohort study using health records and genetic data, 187,341 adults aged 50+ from the All of Us program, mean follow-up 10.3 years
Summary: Clinicians often can't tell whether attention problems first noticed after 50 are lifelong ADHD or an early sign of cognitive decline, and this study speaks directly to that question. The researchers followed about 187,000 adults aged 50 and older, using health records to identify ADHD, mild cognitive impairment (MCI), and dementia, and also looked at a genetic risk score for ADHD. People with diagnosed ADHD developed MCI or dementia at about 2.7 times the rate of those without it (8.96 vs 3.29 per 1,000 person-years). The adjusted risk fell from about 4.6 times higher to between 2.3 and 3.1 times higher once other health conditions, depression, anxiety, substance use, education, smoking, and healthcare visits were accounted for, but it stayed significant. A higher ADHD genetic score was linked to about 30–35% higher risk, and that held across every analysis. On average, ADHD first appeared in the health record around age 53, so some of these diagnoses may have been early decline labeled as ADHD. The link weakened as a longer gap between the two diagnoses was required and was no longer significant at 9 years, by which point most of the cases had been reclassified. The ADHD group was mostly female, white, and well educated, and the study had no data on whether ADHD treatment changes risk.
Takeaways for clinicians
The link based on diagnosis is real but smaller than the headline number. Part of it likely reflects early decline, about three times as many prior healthcare visits, and much higher rates of depression, anxiety, and substance use in the ADHD group.
The genetic score finding isn't affected by early decline being mislabeled as ADHD. However, it rose alongside depression, anxiety, and substance use and varied by ancestry, so it may reflect risk shared with other conditions rather than a direct effect on the brain.
It speaks directly to two common questions: whether a first ADHD referral after 50 is lifelong ADHD, emerging decline, or both, and how to read cognitive change when someone's baseline was never typical.
Takeaways for families
Adults with ADHD were more likely to develop memory problems later in life, but most people in the study did not (about 93% of the ADHD group didn't).
The study doesn't show that ADHD causes dementia, and it couldn't look at whether ADHD treatment changes the risk.
Attention or focus problems that are first noticed later in life can have more than one explanation.
