What Is Your Reaction Time? Average Speeds by Age (And How to Get Faster)
How fast can you react? It’s a surprisingly telling measure of neurological health — and one of the most trainable cognitive skills you have. Here’s everything you need to know about human reaction time, plus how to measure and improve yours.
What Is Reaction Time?
Reaction time is the interval between a stimulus (something you see, hear, or feel) and the beginning of your response. It sounds simple, but it involves an entire chain of neural events:
- Your sensory organs detect the stimulus
- The signal travels along sensory nerves to your brain
- Your brain processes the stimulus and selects a response
- A motor signal travels from your brain to your muscles
- Your muscles contract and the movement begins
Each of those steps takes time — typically milliseconds, but they add up.
Average Human Reaction Time: The Numbers
| Age Group | Average Visual Reaction Time | Rating |
|---|---|---|
| Under 20 | 190–210 ms | Excellent |
| 20–29 | 200–220 ms | Excellent |
| 30–39 | 210–230 ms | Good |
| 40–49 | 220–250 ms | Good |
| 50–59 | 240–280 ms | Average |
| 60+ | 280–350 ms | Slower |
Note: These are for simple visual reaction time (see light → press button). Complex decisions take significantly longer.
What Affects Your Reaction Time?
Factors that slow you down:
- Fatigue — Sleep deprivation adds 50–100 ms to simple reactions
- Alcohol — Even a modest blood-alcohol level significantly impairs reaction speed
- Distraction — Divided attention adds processing time
- Age — Processing speed peaks in the mid-20s and gradually declines
- Temperature — Cold slows nerve conduction velocity
Factors that help:
- Caffeine — Reduces reaction time by 10–30 ms in moderate doses
- Aerobic fitness — Fitter individuals consistently show faster reactions
- Practice — Regular reaction-time training measurably improves performance
- Anticipation — Knowing what to expect and when dramatically reduces RT
Simple vs. Choice Reaction Time
Simple reaction time: One stimulus, one response (green light → press button). Average: ~200 ms.
Choice reaction time: Multiple possible stimuli, multiple possible responses. Each additional option adds ~150 ms (Hick’s Law). This is why Formula 1 drivers train not just for speed, but to narrow the decision tree they must navigate.
How to Train Your Reaction Time
The good news: reaction time is trainable. Research shows consistent practice over 4–8 weeks produces measurable improvements in both speed and consistency.
The key principles:
- Practice regularly — Short daily sessions beat occasional long ones
- Vary the stimulus — Don’t let your brain fall into a pattern-prediction trap
- Track your scores — Visible progress is a powerful motivator
- Rest between sessions — Neural adaptation happens during recovery
Test Yours Right Now
Our Reaction Time Test gives you 5 rounds with a random delay before the green trigger — preventing anticipation and giving you a true measure of your raw reaction speed. Your result is scored, saved to the leaderboard, and earns XP toward your BrainKing level.