How Reaction Time Changes with Age
Peaks earlier than people think and declines slower than people fear.
TL;DR — Visual reaction time peaks around age 24 at roughly 190 ms, holds within 10 ms of peak through age 35, then increases by about 1 ms per year through age 60 and accelerates afterwards.
The age curve is gentler than most people expect. A focused 50-year-old beats a tired 25-year-old on the same test more often than not.
The full curve, decade by decade
| Age band | Median reaction | Notes |
|---|---|---|
| 8–12 | 290 ms | Myelination incomplete |
| 13–17 | 230 ms | Approaching adult speed |
| 18–24 | 190–200 ms | Peak window |
| 25–35 | 200–215 ms | Plateau |
| 36–45 | 215–235 ms | Slow drift up |
| 46–55 | 235–260 ms | Conduction velocity drops |
| 56–65 | 260–290 ms | Visible decline |
| 66+ | 290–330+ ms | Accelerating decline |
What causes the peak at 24
Myelination — the fatty insulation around nerve axons — completes in the early twenties. Fully myelinated nerves conduct signals 10–100x faster than unmyelinated ones. By 24, every fibre involved in the reaction pathway is at full conduction speed.
What causes the slow rise afterwards
Three things change gradually. Nerve conduction velocity drops by about 0.4% per year after 30. White matter integrity declines, slowing inter-region communication. And the visual system itself gets slower as the retina ages and the lens hardens.
What you can do at any age
- Sleep — restores roughly 25 ms of average reaction over 7+ hours.
- Hydration — being 1–2% dehydrated adds 15–30 ms.
- Cardio fitness — adds 10–20 ms of resilience under load.
- Targeted reaction drills — close 30–60 ms over 2 weeks regardless of age.
Frequently Asked Questions
Can I be as fast at 50 as I was at 25?
Within 20–30 ms, yes, with training. The biological gap is real but small.
When does reaction time start declining?
Subtly from the late thirties, visibly from the late forties.
Do teenagers really react slower than young adults?
On average yes, by 30–50 ms, due to incomplete myelination.
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