AbacusKitCalculators & tools
AbacusKit · https://abacuskit.com/global/age/ · 2026-10-22

Age Calculator

Someone born on 15 June 1990 is 36 years old on 20 October 2026. Enter a date of birth to see yours, to the day.

The page starts with today’s date

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How it works

Enter a date of birth. The calculator starts with today’s date for “Age on” and counts the whole years, then the whole months, then the days since the birth date. It also shows the total months, full weeks and days, and when the next birthday is.

Change “Age on” to see an age on any other date.

Formula and worked example

Years and months = the largest number of whole months from the date of birth that does not go past the date. Days = what is left. Total days = the date minus the date of birth.

For someone born on 15 June 1990 on 20 October 2026:

  1. Years: 36
  2. Months after the years: 4
  3. Days after the months: 5
  4. Total days lived: 13,276
  5. Days until the next birthday: 238

Frequently asked questions

How is age calculated?

Age counts whole years from the date of birth, then whole months, then days. Someone born on 15 June 1990 turns 36 on 15 June 2026; on 20 October 2026 they are 36 years, 4 months and 5 days old.

How can I find my age on a past or future date?

Change the "Age on" date. The page starts with today's date, but you can pick any date after the date of birth, for example the first day of a school year or the date of an application.

What happens with a birthday on 29 February?

In years without 29 February the birthday is counted on 28 February here. Some countries treat 1 March as the birthday in law, so check the rule that applies to you for legal questions.

Why does the month count change on the 31st?

Months are counted from the date of birth, and a shorter month ends earlier. Someone born on 31 January has completed one month on 28 February (29 in a leap year).

Can I see how many days old I am?

Yes. The result lists the total days, full weeks and months lived, and the days until the next birthday.

Which dates work?

Dates of birth and comparison dates from 1900 to 2100. The comparison date cannot be before the date of birth.

Sources and methodology

Last updated 2026-10-20. Calculator version 1.0.0.Read how we calculate for our verification process.

Results are estimates for information only and are not financial, tax or legal advice.