Does reaction time get worse with age?
Yes — reaction time slows measurably with age, typically by 3–4ms per decade starting from the mid-20s. This is one of the most consistent findings in cognitive aging research and is visible in population-level data from the Reaction Time test.
| Age group | Avg RT | Top 10% |
|---|---|---|
| 13–17 | 250ms | <180ms |
| 18–24 | 240ms | <170ms |
| 25–34 | 248ms | <185ms |
| 35–44 | 260ms | <200ms |
| 45–54 | 275ms | <215ms |
| 55–64 | 295ms | <235ms |
| 65+ | 330ms | <265ms |
The slowing is caused by progressive changes in myelination (the insulating sheath around nerve fibres), reduced dopaminergic signalling, and slower sensory processing in the visual cortex. These are normal neurological changes, not pathological.
Importantly, active individuals age better. Older athletes who maintain cardiovascular exercise show RT curves 10–15 years younger than sedentary peers. This is why the Science page emphasizes aerobic exercise as the single most evidence-backed brain health intervention.
Note: A sudden, unexpected increase in your personal reaction time — not explained by fatigue or illness — can occasionally be a sign of a neurological issue. It is not a diagnostic tool, but consistent dramatic slowing in a short period is worth discussing with a doctor.
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Quick Answer
Yes — simple RT peaks in your early 20s and slows ~3–4ms per decade. By age 60 the average is ~300ms vs ~250ms at 20.
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