How do I calculate my age from my date of birth?

Subtract your birth year from the current year. If your birthday has not happened yet this year, subtract one more year from that total. Then count the months and days separately using the same subtract-and-borrow method. This tool does all of that automatically. You just get the finished answer.

Can I calculate my age on a specific date?

Yes. Instead of leaving the calculate-as-of field on today, pick any date, past or future, and the tool works out your age as of that day. Use this for school enrollment cutoffs, immigration age requirements, or figuring out how old you will be on a future date like a wedding or retirement.

How does this handle leap years?

Leap years are built into the calendar math, not added as an afterthought. If someone's birthday is February 29, this tool treats it as February 28 in non-leap years for counting elapsed years, the same convention most legal and administrative systems use, while still calculating the exact day count correctly underneath.

What is chronological age?

Chronological age is the time that has passed since birth, measured in the calendar: years, months, and days. It is different from biological age, which estimates how old a body seems rather than how long a person has actually been alive. When a form or a doctor asks for your age, chronological age is what they mean.

How is Korean age different from international age?

Korean age starts at one, not zero, on the day someone is born, and everyone's age increases together on New Year's Day instead of on individual birthdays. Depending on birth month, that can put Korean age one or two years ahead of the international age most of the world uses. Toggle Also show Korean age to see both numbers at once.

How do I calculate age difference between two people?

Switch to the Age Difference tab, enter both birth dates, and the calculator returns the gap as years, months, and days, plus a flat day count if you need one number instead of three. It works the same way whether the gap is a few months or several decades.

How accurate is this online tool?

It is accurate to the day, using real calendar date math rather than a simplified days-divided-by-365 estimate. Leap years, varying month lengths, and the borrow-a-month logic are all handled correctly. The one thing it cannot account for is a wrong birth date typed in.

How do I calculate age in Excel?

Put the birth date in a cell, then wrap it in Excel's DATEDIF function with "Y", "YM", and "MD" as the unit arguments to pull out years, months, and days separately. The full formula is in the Excel section above. It is the same calendar-based approach this tool uses, just typed out manually.

Yes. Everything runs in your browser using JavaScript. Your birth date never leaves your device. There are no servers processing your information and no account required. You can disconnect from the internet after loading the page and the calculator still works.

Can I use this for my pet?

Yes. Click the Pet Age tab, choose dog or cat, and enter how many years old your pet is. The tool converts to human-equivalent age using the standard veterinary formula, not the old seven dog years equals one human year shortcut.

Wie alt ist jemand, geboren 1965? Altersrechner

Your date of birth

Date of birth

Calculate age as of

Also show Korean age

Results

Total days: 22,368
Total weeks: 3,195
Total months: 734
Total hours: 536,832
Seconds lived: 0

1965 age range (2026)

	Alter
Alter nach dem Geburtstag (frühestes Datum im Jahr)	61
Alter vor dem Geburtstag (spätestes Datum im Jahr)	60

Browse 1965 by month

january 1965 february 1965 march 1965 april 1965 may 1965 june 1965 july 1965 august 1965 september 1965 october 1965 november 1965 december 1965

Example dates in 1965

Geburtsdatum	Aktuelles Alter	Calculator
1. Januar 1965	61	Open
15. Juni 1965	61	Open
11. September 1965	61	Open
31. Dezember 1965	60	Open

All dates in 1965 (sample)

Date	Page
1. Januar 1965	january-1-1965
15. Januar 1965	january-15-1965
31. Januar 1965	january-31-1965
1. Februar 1965	february-1-1965
15. Februar 1965	february-15-1965
28. Februar 1965	february-28-1965
1. März 1965	march-1-1965
15. März 1965	march-15-1965
31. März 1965	march-31-1965
1. April 1965	april-1-1965
15. April 1965	april-15-1965
30. April 1965	april-30-1965
1. Mai 1965	may-1-1965
15. Mai 1965	may-15-1965
31. Mai 1965	may-31-1965
1. Juni 1965	june-1-1965
15. Juni 1965	june-15-1965
30. Juni 1965	june-30-1965
1. Juli 1965	july-1-1965
15. Juli 1965	july-15-1965
31. Juli 1965	july-31-1965
1. August 1965	august-1-1965
15. August 1965	august-15-1965
31. August 1965	august-31-1965
1. September 1965	september-1-1965
15. September 1965	september-15-1965
30. September 1965	september-30-1965
1. Oktober 1965	october-1-1965
15. Oktober 1965	october-15-1965
31. Oktober 1965	october-31-1965
1. November 1965	november-1-1965
15. November 1965	november-15-1965
30. November 1965	november-30-1965
1. Dezember 1965	december-1-1965
15. Dezember 1965	december-15-1965
31. Dezember 1965	december-31-1965

Altersmeilensteine

Alter	Jahr erreicht
1	1966
5	1970
10	1975
13	1978
16	1981
18	1983
21	1986
25	1990
30	1995
40	2005
50	2015

So wird berechnet

Das Kalenderalter zählt vollendete Geburtstage. Grob: Referenzjahr minus Geburtsjahr, minus 1 wenn der Geburtstag noch aussteht.
Genaues Alter = Jahre + Monate + Tage zwischen Geburts- und Referenzdatum, mit korrekter Monatslänge.

Age = Reference date − Birth date

Weeks ≈ total days ÷ 7. Hours = total days × 24. Minutes = total hours × 60 (exact for whole-day spans).

Nahe Geburtsjahre

1963 1964 1965 1966 1967