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This calculator displays a person's age in years, months, days, hours, minutes, and total days, given the birthday date. This is a somewhat limited version of How many days are there between two dates?, which does not require you to mess with the second date - it shows the duration from a given date to the current date.
You can also save your birthday and use permalink to always see your age without touching date value. Like that one, showing days passed since the birthday of Pierre de Fermat, a 17th-century French lawyer, better known nowadays as a great mathematician.