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Calculate your exact age in years, months, and days from your birthdate. See total days lived, day of the week born, and countdown to next birthday.
Age calculation determines the exact time elapsed between a birth date and a target date, expressed in years, months, and days. It accounts for varying month lengths and leap years.
Enter your birthdate to calculate your exact age
Formula
Age = (Today − Birthdate) in years, months, daysToday = the current calendar date
Birthdate = the date of birth entered by the user
Worked Example
Born April 10, 1990 → age on February 19, 2026
Did you know? If you live to 80, you will have experienced exactly 20 leap years, adding 20 extra days to your total lifespan. People born on February 29 are called 'leaplings' — fewer than 5 million exist worldwide.
Sources
• The average person lives about 27,375 days (75 years).
• A leap year occurs every 4 years, adding an extra day to February.
• Your "golden birthday" is when your age matches your birth date.
• A person born on Feb 29 technically has a birthday only every 4 years.
| Age | Days | Milestone |
|---|---|---|
| 1 year | 365 | Infant |
| 13 years | 4,745 | Teenager |
| 18 years | 6,570 | Legal adult (US) |
| 21 years | 7,665 | Drinking age (US) |
| 65 years | 23,725 | Retirement age |
| 100 years | 36,500 | Centenarian |
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