Work & time

Age calculator

You enter your date of birth and key date. The calculator shows the exact age and the entire time period.

Updated on Apr 21, 2026 Calculator, calculation path and examples on one page

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Calculator

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Examples

Typical calculations

Born on June 14, 1990.

Adult person

Old: 35 years, 10 months, 7 days

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Born on November 3rd, 2018.

child

Old: 7 years, 5 months, 18 days

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Deadline exactly on birthday.

Round birthday

Old: 40 years, 0 months, 0 days

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FAQ

Frequently asked questions

Does the calculator take leap years into account?

Yes. The calendar difference takes real months and leap years into account.

Can I also enter a future date?

No. The key date must be on or after the date of birth.

Why does the calculator show years, months and days?

This makes the age more accurate and easier to understand than just using decimal values.

Is this suitable for authorities?

For deadlines and legal questions, the respective official date always counts.

Can I also use this for anniversaries?

Yes. The calculator is also suitable for round birthdays and anniversary dates.

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Sources and notes

Rule status and context

Calculation
Calendar-exact difference between date of birth and key date.