Average Reaction Time by Age: What the Research Shows
Someone finishes a round on our reaction time test and wants to know exactly one thing: is that number good? The honest answer depends heavily on age, and most people are wrong about it in one direction or the other: either they assume reflexes fall off a cliff at 40, or they assume age barely matters at all. Neither is true.
What actually happens is slower and more interesting: reaction time peaks in your twenties, then creeps upward by about half a millisecond a year for decades. Below is the data, decade by decade, plus what actually explains the gap between your score and the study numbers.
How Fast Should You Be?
For a healthy adult, average simple reaction time to a visual stimulus is about 200-250ms, based on large studies including the Baltimore Longitudinal Study of Aging and a 2015 review in Frontiers in Human Neuroscience. Reaction time is fastest in your twenties, then slows by roughly 0.5ms a year after that, a gradual decline, not a sudden drop.
Average Reaction Time by Age Group
The clearest decade-by-decade numbers come from a 2015 Frontiers study that measured simple visual reaction time across seven age bands, and from Fozard et al.'s Baltimore Longitudinal Study of Aging, which followed 1,265 people aged 17 to 96. The two studies line up well:
| Age Group | Average Simple RT | Notes |
|---|---|---|
| Under 10 | Slower than teens or adults | Still developing; highest variability of any age group |
| 10-17 | ~210-230ms | Approaching adult speed but not there yet |
| 18-24 | ~218ms | Fastest decade measured |
| 25-31 | ~221ms | Barely distinguishable from peak |
| 32-45 | ~225-228ms | Slowing becomes measurable, not noticeable day to day |
| 46-58 | ~234-236ms | Consistent with the ~0.5ms/year rate |
| 59-65 | ~239ms | Oldest group directly measured in the Frontiers study |
| 65+ | ~245-260ms (estimated) | Extrapolated from the Baltimore study's rate; variability increases |
The 65+ row is an estimate, not a direct measurement: the Frontiers study only tested up to 65, so anything past that extrapolates from the Baltimore study's confirmed rate of decline. What the Baltimore data does confirm directly is that the slowing continues at roughly the same pace all the way to age 96, and that people get less consistent with age, too. Trial-to-trial variability was highest in the under-10s and over-60s, which tracks with what you'd expect from either end of nervous system development.
Why Reaction Time Changes with Age
Reaction time is a chain: a signal has to hit your eye or ear, travel down a nerve, get processed, and trigger a muscle response. Every link in that chain slows down slightly as you age: nerve conduction velocity drops, and the chemical signals between neurons (neurotransmitters) take a little longer to fire. None of these changes are dramatic on their own. Stacked together over decades, they add up to the 0.5ms-per-year trend in the tables above.
Children move the opposite direction. A young nervous system is still building out its wiring (a process called myelination that wraps nerve fibers in an insulating layer so signals travel faster), which is why reaction time drops steadily through childhood and into the teens before leveling off in the twenties. We cover the full curve, from toddlers to seniors, on our reaction time and age page.
The part people usually miss: this isn't grim news for anyone over 40. A 65-year-old is roughly 20-25ms slower than they were at 20. That's measurable in a controlled test. It is not the kind of gap you'd notice catching a dropped set of keys.
Simple vs. Choice vs. Go/No-Go: How Test Type Matters
Age isn't the only variable. Which test you take changes the number more than a decade of aging does.
| Test Type | Typical Adult Average | What It Adds |
|---|---|---|
| Simple | 200-250ms | Nothing but raw reflex: one signal, one response |
| Choice | ~300-350ms with four options | A decision step, governed by Hick's Law |
| Go/No-Go | 280-320ms | Impulse control: you have to check before you commit |
This is why comparing your choice reaction score against a "average reaction time is 200ms" headline is comparing the wrong things. Choice reaction time adds roughly 100-150ms on top of simple reaction time just from the extra decision. That's Hick's Law, and it has nothing to do with how sharp your reflexes are.
Does Gender Affect Reaction Time?
A little, yes. The Baltimore Longitudinal Study of Aging found that men were faster than women across every age group and every task type tested, and the gap was still there when researchers controlled for age. At the 2008 Beijing Olympics, sprinters' starting-block reaction times averaged 166ms for men and 189ms for women, a 23ms gap, in a population where both groups are about as fast as a human being gets.
The gap is real but small next to what practice and training can do. It shrinks with repetition, and it's dwarfed by the age-related differences we covered above once you're comparing people decades apart rather than sexes within the same age group.
What Counts as a Good Reaction Time?
Numbers only mean something with context. Here's roughly how simple visual reaction time breaks down for adults:
| Range | Category |
|---|---|
| Under 150ms | Elite: rare outside trained athletes and gamers |
| 150-200ms | Fast |
| 200-250ms | Above average |
| 250-300ms | Average |
| Over 300ms | Slower than typical: check sleep, distraction, and device lag first |
Judge yourself against your own age group, not against a Formula 1 driver. F1 drivers average around 200ms from lights-out to clutch release, and competitive gamers in titles like VALORANT and CS2 typically test in the 150-180ms range, but those are people who've spent thousands of hours training exactly this skill under ideal conditions. For a deeper breakdown of where your score sits, see our guide on what counts as a good reaction time, and if gaming benchmarks are what you're after, we've got a full comparison on reaction time for gaming.
Why Online Test Scores Differ from Lab Results
If your score on this site runs a bit higher than the numbers in the table above, that's expected, not a sign you're slow. A lab measures reaction time with dedicated hardware wired directly to a stimulus and a response button. A browser has to go through your monitor, your input device, and the browser's own rendering pipeline first, and each of those adds a small delay: monitor input lag (roughly 5-30ms on most displays), input device lag (1-50ms depending on your mouse or keyboard), and a few extra milliseconds of browser rendering overhead.
Add it up and online scores commonly run 20-60ms slower than equivalent lab measurements. That's exactly why we built this test around performance.now() and requestAnimationFrame, to keep our own measurement error as small as possible, even though we can't eliminate your hardware's contribution. Track your own trend over time rather than chasing an absolute lab number, and you'll get a much more useful signal.
Factors That Affect Your Score
Age explains part of the picture. These explain the rest, and most of them matter more day-to-day than a birthday does:
Sleep is the single biggest modifiable factor. A short night measurably slows reaction time, often more than several years of aging would. Caffeine tends to sharpen reaction time a bit, especially if you're tired to begin with. Exercise and general fitness correlate with faster, more consistent scores. Time of day matters too: most people test faster in the late afternoon than first thing in the morning, a circadian effect. Alcohol does the opposite of caffeine, and the impairment is well documented even at levels well under the legal driving limit.
We go into the evidence and the actual numbers behind each of these on our what affects reaction time page.
Frequently Asked Questions
What is the average reaction time for a 14 year old?
Somewhere around 190-220ms for a simple visual stimulus, close to adult peak performance. By the mid-teens the nervous system is nearly fully developed, which is why teenagers already score close to a 20-year-old on simple reaction tests. The remaining gains through the early twenties are small.
Is 200ms reaction time good?
Yes. A 200ms simple reaction time sits at or below the average for every age group studied, including the fastest decade (the 20s). It puts you in the "fast" to "above average" range for an adult, and it's a strong score for a teenager too.
What is the fastest human reaction time?
The fastest documented simple reaction times sit around 120-150ms, typically in trained athletes or gamers under ideal conditions. Anything under 100ms in a starting-gun context isn't treated as a real reaction at all. World Athletics rules it a false start, since it's faster than the nervous system can process the signal and respond.
Does reaction time get worse with age?
Yes, but slowly. Simple reaction time increases by roughly 0.5ms per year starting in your twenties, according to the Baltimore Longitudinal Study of Aging. That's a gradual slide, not a cliff, and it's partly offset by sleep, fitness, and practice.
How can I improve my reaction time?
Sleep and practice make the biggest difference for most people, with regular exercise and consistent testing conditions close behind. See our full guide on how to improve reaction time for specific drills and how much improvement to realistically expect.
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