About this age calculator
Enter a date of birth to get the exact calendar age in years, months and days: full years first, then full months, with the remainder counted in days. An optional "calculate as of" date (today by default) lets you compute the age at any point in time — handy for seniority or school-year checks.
The tool also totals the days and weeks lived (with leftover days) and counts down to the next birthday: how many months and days away, and which weekday it falls on. For 29 February birthdays, non-leap years roll over to 1 March; a birth date after the as-of date is reported as an error. Everything runs locally — the date never leaves your browser.