Your exact age is the time elapsed since your birth date, expressed in years, months, and days. Because months have different lengths, counting it precisely takes a little care — which is what this calculator does.
How age is counted
We count complete years first, then the leftover complete months, then the remaining days, borrowing from the previous month when needed. The result also shows your age as a total number of months and days, which is handy for milestones.