Find your exact age in years, months, days, hours and seconds: with a live countdown to your next birthday that ticks down every second in real time. Works for any date of birth from any era.
| Milestone | Age |
|---|---|
| First steps | ~1 year |
| School age | 5–6 years |
| Legal adulthood (most countries) | 18 years |
| Car hire (no surcharge, most US) | 25 years |
| Early retirement (US Social Security) | 62 years |
| Full retirement age (US) | 66–67 years |
| Centenarian | 100 years |
Enter your date of birth
Select your birthday on the left and tap Calculate My Age for a live breakdown: including a real-time countdown to your next birthday.
🎂 Next Birthday Countdown
Age is calculated by finding the difference between the current date and the date of birth, expressed in years, months and days. The calculation accounts for varying month lengths and leap years.
The total number of days, hours and seconds lived is calculated from the exact millisecond difference between the two dates using the system clock: which is why the seconds counter updates live.
Leap year handling: If your birthday falls on 29 February, your age increments on 28 February in non-leap years and on 29 February in leap years.
Different cultures count age differently:
This calculator uses the standard Gregorian (Western) age system.