What Is Reaction Time?
Reaction time is the interval between a stimulus and your response to it. In everyday life, it affects driving safety, sports performance, and countless other activities. It is a direct measure of how quickly your nervous system processes information.
Average Reaction Time by Age
Research shows that reaction time follows a predictable pattern across the lifespan:
Ages 18–24: Average ~250ms — Peak reaction time. Young adults have the fastest reflexes.
Ages 25–34: Average ~260ms — Slight decline begins, but still very fast.
Ages 35–44: Average ~275ms — Noticeable but modest slowing.
Ages 45–54: Average ~290ms — Reaction time continues to slow gradually.
Ages 55–64: Average ~310ms — More significant slowing becomes apparent.
Ages 65+: Average ~350ms or slower — Reaction time slows considerably with age.
What Counts as a Fast Reaction Time?
- Under 150ms: Exceptional — typical of elite athletes and professional gamers - 150–200ms: Excellent — faster than 95% of people - 200–250ms: Above average — sharp reflexes - 250–300ms: Average — normal human range - 300–400ms: Below average — may be affected by fatigue or age - Over 400ms: Slow — consider retesting when rested
Factors That Affect Reaction Time
Age: Reaction time peaks in the mid-20s and gradually slows after 30.
Sleep: Sleep deprivation can slow reaction time by 50–100ms. Even one night of poor sleep has measurable effects.
Caffeine: Moderate caffeine intake (100–200mg) can improve reaction time by approximately 10ms.
Alcohol: Even small amounts of alcohol significantly impair reaction time.
Practice: Regular training can improve reaction time by 20–40ms over time.
Stress and distraction: High stress and divided attention both slow reaction time.
How to Improve Your Reaction Time
1. Get adequate sleep — 7–9 hours per night is optimal for cognitive performance 2. Exercise regularly — aerobic exercise improves neural processing speed 3. Practice — reaction time training games and sports can build faster reflexes 4. Stay hydrated — dehydration impairs cognitive function 5. Reduce stress — chronic stress slows neural processing
Test Your Reaction Time
Want to measure your own reaction time? Take our free Reaction Time Test and see how you compare to people your age.