Leap years add an extra day to the calendar — February 29th — and they have a fascinating impact on age calculation, especially for people born on this rare date.
What Is a Leap Year?
A leap year occurs every 4 years, except for years divisible by 100 but not by 400. This means 2000 was a leap year, but 1900 was not. The extra day keeps our calendar aligned with Earth's orbit around the Sun.
February 29th Birthdays
About 5 million people worldwide were born on February 29th. These "leaplings" technically only have a birthday every 4 years. In non-leap years, most leaplings celebrate on either February 28th or March 1st.
How Leap Years Affect Age Calculation
For leaplings, calculating exact age in years is tricky. Someone born on February 29, 2000 would technically turn 1 on March 1, 2001 (since Feb 29 didn't exist in 2001). Most official systems count March 1 as the birthday in non-leap years.
Fun Facts
- The odds of being born on Feb 29 are about 1 in 1,461
- Some cultures consider leaplings unlucky, while others see them as special
- In Ireland, tradition says women can propose to men on leap day
Our age calculator correctly handles February 29th birthdays, giving you accurate results regardless of whether the current year is a leap year.