If you were born in a leap year (such as 2000 or 2004), you will need to take the leap year into account when calculating your age. In leap years, an extra day is added to the calendar (February 29th), which means that you will have an additional day of age for that year. To calculate your age in a leap year, you can use the same formula as usual and add one day to your age if your birthday falls on or after February 29th.