When does reaction time peak?
A large-scale analysis using data from an online reaction time test (involving over 3,000 participants aged 16–44) found that simple reaction time peaked at approximately age 24. This aligns with broader evidence that processing speed — the rate at which the brain can receive, process and respond to information — reaches its maximum in the mid-20s.
Average simple reaction time at age 24 is approximately 200–250 milliseconds. By age 60, this has typically increased to 280–320 milliseconds — a decline of roughly 2–3ms per year from peak.
Why does reaction time decline?
Neural conduction velocity
Action potentials (electrical signals) travel along nerve fibres at speeds determined partly by myelin sheath integrity. Myelin gradually deteriorates with age, slowing conduction velocity and therefore increasing reaction time.
Reduced neurotransmitter efficiency
Dopaminergic signalling — critical for rapid motor response — becomes less efficient with age, contributing to slower response initiation.
Central processing speed
The cognitive processing component of reaction time — perceiving the stimulus and selecting a response — slows independently of motor execution speed. This is reflected in the broader cognitive slowing seen across many domains in older age.
Can you maintain reaction time with age?
Reaction time cannot be prevented from increasing with age, but the rate of decline is substantially modifiable. Regular aerobic exercise consistently shows the strongest effect — physically fit older adults routinely match or outperform sedentary younger adults on reaction time measures.
Video game players show measurably faster reaction times than age-matched non-players, with evidence that consistent practice maintains processing speed. The mechanism is likely enhanced attention, perceptual speed and reduced cognitive load during familiar motor tasks.
The gap between the fastest and slowest reaction times at any given age is enormous — much larger than the average age-related decline. This means lifestyle and practice factors dominate over chronological age for most people.
Average simple reaction time by age group
| Age Group | Average Reaction Time | Change from Peak (age 24) |
|---|---|---|
| 16–20 | ~240ms | Near peak |
| 21–25 | ~220ms (peak) | Peak |
| 26–35 | ~235ms | +15ms |
| 36–45 | ~255ms | +35ms |
| 46–55 | ~275ms | +55ms |
| 56–65 | ~300ms | +80ms |
| 66+ | ~330ms+ | +110ms+ |
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