Calculate Your Age
Enter birth date and optional end date to calculate exact age.
Age Calculation Results
Total Age
Exact duration
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In Years
0 years
In Months
0 months
In Days
0 days
In Weeks
0 weeks
Next Birthday
Days until next birthday
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Zodiac Sign
Astrological sign
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Age Milestones
Understanding Age Calculation: A Complete Guide
Age calculation seems simple, but accounting for leap years, different month lengths, and time zones makes it complex. Our age calculator handles all these variables to give you precise results.
How Age is Calculated
Age calculation involves several factors:
- Leap Years: Every 4 years (except century years not divisible by 400) has 366 days
- Month Variations: Months have 28, 29, 30, or 31 days
- Time Zones: Birth time zone vs. current time zone affects exact age
- Day Count: Whether to include the start day or end day
Important Age Milestones
| Age | Milestone | Significance |
|---|---|---|
| 13 | Teenager | Become a teenager |
| 16 | Driving (US) | Eligible for driver's license |
| 18 | Legal Adult | Voting, contracts, military |
| 21 | Drinking (US) | Legal drinking age |
| 65 | Retirement | Medicare eligibility |
Frequently Asked Questions
How do you calculate age accurately?
We calculate the difference in years, then adjust for months and days. For example, if you were born on April 15, 1990, on March 15, 2024, you're 33 years, 11 months, and 0 days old.
What about leap year birthdays?
If born on February 29, you celebrate on February 28 or March 1 in non-leap years. Age is calculated based on actual days lived.