Age Calculator
Calculate your exact age, next birthday countdown, zodiac sign and life statistics
Defaults to today. Change to calculate age at any past or future date.
How Age Is Calculated
Age is calculated by comparing your date of birth to today's date (or any date you specify). The years component counts complete years since birth. The remaining months and days are calculated from the last birthday to the current date, accounting for varying month lengths and leap years.
For example, someone born on 31 January who we check on 28 February has completed 0 months and 28 days since their last birthday in that period — not 1 month, because February is shorter than January.
// Leap Year Birthdays
People born on 29 February only have a "true" birthday every 4 years. In non-leap years, most celebrate on 28 Feb or 1 March.
// Age Worldwide
In South Korea, everyone is 1 at birth and gains a year on New Year's Day — so Koreans are typically 1–2 years older by Korean reckoning.
// Oldest Person
The verified oldest person ever was Jeanne Calment of France, who lived to 122 years and 164 days (1875–1997).
// Life Expectancy
Global average life expectancy is about 73 years. Japan leads at ~84 years; women live ~5 years longer than men on average globally.