What Is a Good Reaction Time? Average Reaction Time by Age

Reaction time is the gap between a signal reaching your senses and your body responding to it. For a simple visual task — click when the screen turns green — the average adult lands around 250 milliseconds (ms). Anything under 200 ms is fast, and the quickest measured responses sit near 100 ms, which is close to the physical floor for seeing a light and moving a finger.

Average reaction time by age

Simple visual reaction time follows a shallow U-shape across life. It is slowest in early childhood, bottoms out in the late teens and twenties, and rises gradually after that.

• Under 12: 250–400 ms, dropping quickly year on year
• 12–17: 200–260 ms
• 18–24: 190–230 ms — the fastest most people ever get
• 25–34: 200–240 ms
• 35–44: 210–250 ms
• 45–54: 230–270 ms
• 55–64: 250–290 ms
• 65+: 270–330 ms and up

The differences are real but small — roughly 0.5 to 1 ms slower per year after the mid-twenties. Fitness, sleep and practice matter more than a decade of age.

What counts as a good reaction time

• Under 180 ms: elite — trained athletes, competitive gamers
• 180–220 ms: fast
• 220–280 ms: normal for a healthy adult
• 280–320 ms: on the slow side; often tiredness or a high-latency screen
• Over 320 ms: worth retesting when rested, on a wired setup

What changes your reaction time

• Sleep and alertness — a poor night can add 30–50 ms
• Caffeine — a modest, short-lived improvement
• Warm-up — the first two or three attempts are usually your slowest
• Screen and input lag — a 60 Hz monitor plus a wireless mouse can add 30–50 ms of hardware delay that has nothing to do with your brain
• Simple vs choice — deciding which button to press adds 100–150 ms on top of a simple response
• Age — a slow, steady drift, mostly in nerve conduction speed

How to measure yours

Use a browser test that averages several attempts so one lucky or distracted click does not define the result. Our reaction time test reports the millisecond value for each try and your mean; the full reaction time test puts your score against typical ranges by age.

Frequently asked questions

Is 200 ms a good reaction time? Yes. It is faster than most adults and typical of someone who is young, alert and using low-latency hardware.

What is the fastest possible human reaction time? Around 100–120 ms for a simple visual signal. Below that you are anticipating rather than reacting.

Why is my reaction time over 300 ms? Usually tiredness, no warm-up, or display and mouse latency. Retest when rested on a wired setup before drawing conclusions.

Does reaction time get worse with age? Slightly. Expect about 0.5–1 ms per year after your mid-twenties, which good sleep and aerobic fitness partly offset.

Can you train reaction time? You can shave a modest amount and, more importantly, hit your personal best far more consistently. The underlying nerve-conduction speed has a floor, so gains are real but bounded.