Age Calculator
Calculate your exact age in years, months and days, the next birthday countdown, days lived, zodiac sign and Chinese zodiac.
What is it
Your age is not just a number of years — birthdays skip months and days, so "30 years old" hides the leftover months and days. This tool subtracts your birth date from today piece by piece: years first, then months, then the leftover days. It also counts every single day you have lived and tells you exactly when your next birthday arrives.
Notes & fun facts
Astronaut John Glenn was 77 when he returned to space in 1998, making him the oldest person to orbit Earth at the time. And the oldest verified person ever, Jeanne Calment, lived to 122 years and 164 days — she reportedly met Van Gogh as a girl. Age really is just a very precise count of days.
Origin & history
Western zodiac signs come from Babylonian astronomy around the 5th century BC, later formalized by Ptolemy in his Tetrabiblos (2nd century AD). The 12-animal Chinese zodiac is generally traced to the Han dynasty (206 BC – 220 AD), tied to the 12 Earthly Branches. Exact age counting itself became common once cheap calendars spread in the 20th century.