It peaks in your twenties, then slips
Reaction speed rises steeply through childhood, reaches its best around age 24, and stays near that level throughout your thirties. Decline sets in after that at roughly 2–4 ms a year. The effect is genuine but mild. A sharp, well-rested 60-year-old will still beat a distracted 25-year-old without much trouble.
Of the two slopes, the early climb is the steeper one. A meta-analysis pooling dozens of developmental studies showed children's reaction times dropping toward the adult baseline at a rapid, predictable pace across childhood and adolescence. The curve flattens once the nervous system finishes maturing in the early twenties.
Evidence for the later slowdown comes from somewhere much bigger. Measuring simple and choice reaction time in thousands of adults, the United Kingdom Health and Lifestyle Survey confirmed the age effect but found it small alongside individual variation. It shifts the population average. Nobody's personal ceiling is set by it.
Typical median simple visual reaction time by age bracket, pooled from published simple-reaction studies — sharp gains through childhood (Kail, 1991), a plateau across the twenties and thirties, then a slow decline from about 50 onward (Der & Deary, 2006). Individual variation stays wide at every age.
Who reacts fastest?
Training does help, though usually less than people expect, and a faster nerve is seldom the reason. Sport-specific studies put trained competitors ahead of untrained peers by tens of milliseconds, not hundreds. Anticipation accounts for much of that margin: catching a cue slightly early means the response has already begun by the time the "go" signal arrives.
Different studies produced the numbers below using different equipment. One used a mouse click, another a cockpit light-and-button rig, a third a combined visual and audio task. No single ruler connects them. The direction, however, holds throughout. Focused, practiced people do react faster than distracted, unpracticed ones, by a real but limited margin.
| Group | Reaction time | What was measured |
|---|---|---|
| Esports pros | ~219 ms, vs ~271 ms in novices | Mouse-click simple reaction time, professional cybersportsmen (Gostilovich et al., 2023) |
| Fighter pilots | ~223 ms | Simple visual reaction time, 62 U.S. Navy fighter pilots (Morris & Hamilton, 1986) |
| F1 drivers | ~330 ms, vs ~370 ms in trained non-racing controls | Elite racing drivers, combined visual/audio reaction-and-decision test (Baur et al., 2006) |
| Average adult | ~250 ms | Simple click on a visual signal (Kosinski, 2008) |
| Tired or under-slept | ~285 ms | Population average plus the ~35 ms simple-reaction penalty measured after short sleep (Kosinski, 2008; Dutil et al., 2025) |
Where those milliseconds go
A "reaction" isn't one event. Think of it as a short relay through the nervous system, with the finger responsible only for the final leg.
First the signal runs from a sensory receptor up a nerve to the brain, which for anything visual costs on the order of 20 ms. Recognising that signal and issuing a motor command comes next, and at roughly 120 ms this is by far the largest part of the total. Sending the command back down toward the muscle adds about 60 ms. The muscle then needs another 50 ms or so to contract and register the click.
What practice shortens is mainly the middle step, the decision, not the wiring on either side of it. That explains the shape of the group comparisons above. Trained people transmit nerve signals no faster than anyone else. They simply recognise the cue and commit to a response sooner.
| Stage | What happens | Rough share of the total |
|---|---|---|
| Receptor to brain | A photoreceptor or the cochlea turns the stimulus into a nerve signal and sends it toward the brain | ~20 ms |
| Recognition and decision | The signal is identified and a motor command is issued — the largest step | ~120 ms |
| Brain to muscle | The motor command runs back down a nerve toward the responding hand | ~60 ms |
| Muscle contracts | The finger or hand physically moves and the click or key-press registers | ~50 ms |
- 01Kosinski, R. J. (2008). A literature review on reaction time. Clemson University. Kosinski, R. J. (2008). A literature review on reaction time. Clemson University.
- 02Der, G., & Deary, I. J. (2006). Age and sex differences in reaction time in adulthood: results from the United Kingdom Health and Lifestyle Survey. Psychology and Aging, 21(1), 62-73. Der, G., & Deary, I. J. (2006). Age and sex differences in reaction time in adulthood: results from the United Kingdom Health and Lifestyle Survey. Psychology and Aging, 21(1), 62-73.
- 03Kail, R. (1991). Developmental change in speed of processing during childhood and adolescence. Psychological Bulletin, 109(3), 490-501. Kail, R. (1991). Developmental change in speed of processing during childhood and adolescence. Psychological Bulletin, 109(3), 490-501.