Numarly

Brain Age Calculator

Estimate your brain age based on lifestyle habits.

What is it?

This calculator gives a fun, informal estimate of your 'brain age' by adjusting your real age up or down based on self-reported sleep, exercise, and screen time habits.

Formula

  • Sleep under 6 hrs: +5 years | Sleep 7-8 hrs: −3 years
  • Exercise 4+ days/week: −4 years | Exercise ≤1 day/week: +3 years
  • Screen time over 6 hrs: +4 years | Screen time ≤3 hrs: −2 years

Formula Explanation

Starting from your actual age, the calculator applies point adjustments for each of three lifestyle habits commonly associated with general wellness — better sleep and more exercise subtract years, while poor sleep and excessive screen time add years. The adjustments are additive across all three factors.

Example Calculation

A 30-year-old who sleeps 7.5 hours, exercises 5 days a week, and has 2 hours of screen time gets 30 − 3 − 4 − 2 = 21, a brain age 9 years younger than their actual age.

How to Use

  1. Enter your actual age.
  2. Enter your average sleep hours per day.
  3. Enter your exercise days per week.
  4. Enter your average screen time hours per day.
  5. Click Calculate Brain Age to see your result.

Benefits

  • Gives quick, encouraging feedback tied to concrete lifestyle habits.
  • Visualizes actual vs. brain age side by side.
  • Highlights which habits (sleep, exercise, screen time) might be worth adjusting.

Use Cases

  • A fun way to reflect on whether current habits are helping or hurting.
  • Comparing brain age scores with friends or family as a lighthearted challenge.
  • Tracking how your score changes if you improve sleep or exercise habits.

What Your Result Means

A brain age lower than your actual age suggests your reported habits align with factors generally associated with healthy aging; a higher brain age flags habits (poor sleep, low activity, high screen time) that general wellness guidance suggests improving.

Tips

  • Answer with your typical week in mind, not just your best or worst day.
  • Small, sustainable changes (an extra hour of sleep, one more exercise day) can meaningfully shift your score.
  • Retake the quiz periodically to see how habit changes affect your result.

Common Mistakes

  • Treating this as a real medical or cognitive assessment rather than a lighthearted lifestyle reflection.
  • Entering aspirational habits instead of your actual typical routine, which defeats the purpose of self-reflection.
  • Reading too much into small point differences, since this is a simplified model, not a precise measurement.

FAQs

Is this a real cognitive or medical test?

No, this is a simple, fun lifestyle-based estimate, not a validated cognitive assessment or medical measurement.

Why do sleep, exercise, and screen time affect the score?

These habits are commonly associated with overall brain health in general wellness research, so they're used here as a lighthearted proxy — not a precise scientific measurement.

Can my brain age be lower than my actual age?

Yes — good sleep, regular exercise, and limited screen time all reduce the calculated brain age below your actual age in this model.

What is the maximum adjustment possible?

The three factors can add up to +12 years or subtract up to -9 years from your actual age, depending on your inputs.

Should I make lifestyle changes based on this result?

This tool is for fun reflection — for actual health or cognitive concerns, consult a doctor rather than relying on this simplified calculator.

For entertainment purposes only.

Last updated: July 25, 2026