Age Calculator
Enter a date of birth to see the exact age in years, months, and days — plus a few extra facts.
| Age | Approx. Days Lived | Approx. Weeks Lived |
|---|---|---|
| 10 years | 3,653 | 522 |
| 20 years | 7,305 | 1,044 |
| 30 years | 10,958 | 1,565 |
| 40 years | 14,610 | 2,087 |
| 50 years | 18,263 | 2,609 |
| 60 years | 21,915 | 3,131 |
| 70 years | 25,568 | 3,653 |
| 80 years | 29,220 | 4,174 |
FAQ
How is exact age calculated?
Age is calculated by counting full years, months, and remaining days between the date of birth and the target date, accounting for varying month lengths and leap years — not just subtracting birth year from the current year.
Why might my age differ from a simple year subtraction?
Subtracting birth year from the current year gives the wrong answer before your birthday has happened yet in the current year, since a full year hasn't actually passed. This calculator accounts for whether the birthday has occurred yet.
Does this account for leap years?
Yes — the calculation is based on actual calendar dates, so leap years (and the extra day in February) are automatically factored into the day and week counts.
What is this useful for?
Common uses include checking eligibility ages for school, work, or legal requirements, working out exact age for medical or legal forms, or just satisfying curiosity about milestones like your 10,000th day alive.
How many days old am I at 30, 40, or 50 years old?
Using a 365.25-day average year to account for leap years, 30 years old works out to about 10,958 days (roughly 1,565 weeks), 40 years old to about 14,610 days, and 50 years old to about 18,263 days. Enter your own birth date above for an exact, calendar-accurate figure.
What is a 'milestone' age in days, like turning 10,000 days old?
Turning 10,000 days old (about 27 years and 4 months) is a popular milestone people like to mark, similar to a round-number birthday. Other commonly celebrated day-count milestones include 1,000 days, 5,000 days, and 20,000 days old.
How accurate is a days-lived total compared to counting every single day?
The total shown above uses your exact birth date and today's date, so it accounts for every actual leap year in your lifetime rather than an average — it's precise to the day, not an estimate.
About this tool
This calculator works out exact age in years, months, and days between any two dates, along with total days and weeks lived and a countdown to the next birthday. Everything runs instantly in your browser — no sign-up, no data stored.