Key Takeaways
- Calculate your exact age down to the minute
- A year has 365 days (366 in leap years, every 4 years)
- The average person lives approximately 2.5 billion seconds
- Age can be calculated between any two dates, not just birth to today
- Your chronological age may differ from your biological age
What Is an Age Calculator?
An age calculator is a tool that computes the exact time elapsed between two dates, typically from a birth date to the current date or another specified date. It provides age in multiple units including years, months, weeks, days, hours, and even minutes.
While calculating your age in years seems straightforward, precise calculations must account for varying month lengths (28-31 days), leap years, and time zones. Our calculator handles all these complexities automatically.
Example: Age Calculation
That's over 316,000 hours of life experience!
How Is Age Calculated?
Age calculation involves several steps:
- Calculate full years: Count complete years from birth month/day to current month/day
- Calculate remaining months: Count months after the last birthday
- Calculate remaining days: Count days after the last complete month
- Account for leap years: February has 29 days in leap years (divisible by 4, except centuries not divisible by 400)
Pro Tip: Leap Year Birthdays
If you're born on February 29 (leap day), you technically have a birthday only every 4 years! Most people celebrate on February 28 or March 1 in non-leap years.
Important Age Milestones
Different ages mark significant life events and legal milestones:
| Age | Milestone | Notes |
|---|---|---|
| 13 | Teenager | Social media age requirement in many countries |
| 16 | Driving (learner's permit) | Varies by state/country |
| 18 | Legal adult | Voting, contracts, military service |
| 21 | Full adult privileges (US) | Legal drinking age in the USA |
| 25 | Car rental age | Lower insurance rates typically begin |
| 62-67 | Retirement eligibility | Social Security benefits (varies by birth year) |
Fun Age Facts
- By age 30, you've lived approximately 1 billion seconds
- Your heart has beaten about 1 billion times by age 25
- The average person spends 26 years sleeping in their lifetime
- You've taken approximately 200 million breaths by age 30
- The world's oldest verified person lived to 122 years (Jeanne Calment)
Frequently Asked Questions
Enter your birth date and the date you want to calculate your age on (or leave it as today's date). The calculator will show your exact age in years, months, days, and also provide totals in weeks, hours, and minutes.
A leap year has 366 days instead of 365, with February having 29 days. Leap years occur every 4 years, except for years divisible by 100 (unless also divisible by 400). So 2000 was a leap year, but 1900 was not.
Chronological age is the time since your birth (what this calculator measures). Biological age refers to how old your body appears based on various biomarkers. Lifestyle factors can make your biological age higher or lower than your chronological age.
A common year has 365 days, while a leap year has 366 days. The average year length is approximately 365.25 days, which is why we add a leap day every 4 years to keep our calendar aligned with Earth's orbit.
Yes! While this calculator is commonly used to find your current age from your birth date, you can calculate the time between any two dates. Just enter the start date in the "Date of Birth" field and the end date in the "Calculate Age On" field.
Your half birthday is exactly 6 months after your birthday. For example, if you were born on January 15, your half birthday would be July 15. Some people celebrate half birthdays, especially for children born near holidays.
Discover Your Exact Age
Calculate your age in years, months, days, hours, and even minutes with our free, accurate age calculator.