Age calculator

In U.S. employment law, the Age Discrimination in Employment Act protects workers 40 and older. That 40th birthday is a specific legal threshold that changes your workplace rights overnight.

The U.S. Constitution requires presidents to be 35. Theodore Roosevelt was 42 when he took office (youngest), but if he'd been 34 and 364 days on inauguration day, he'd have been constitutionally ineligible regardless of election results.

Life insurance premiums often change on "policy age" — sometimes your nearest birthday, sometimes your last birthday. The difference can mean hundreds of dollars annually, making exact day counts financially significant.

Most digital age verification checks against birthdate allow access the day before your birthday in some time zones. The 24-hour buffer accounts for date-line edge cases but creates brief windows of technically-underage access.

Enter your birth date and today's date (or any reference date). The "total days" output gives you the exact count. For age on a future date — like your next birthday milestone — change the "as of" date to see projected totals.

Most jurisdictions (U.S., UK, most of Europe) treat March 1 as the legal birthday in non-leap years. A few Asian jurisdictions use February 28. For specific legal purposes — alcohol purchase, contract signing — check local statute. Our calculator ages you one year per year regardless.

Yes. Chronological age is exact time elapsed. Legal age depends on jurisdiction: some count from midnight on your birthday, some from your birth time, some from the day before. A person born at 11:59 PM might be "18" for contract purposes at 12:00 AM in one state but not until 11:59 PM in another.

For most purposes: years, months, days (e.g., "34 years, 7 months, 12 days"). For legal or scientific contexts: total days (e.g., "12,642 days"). For casual use: years with decimal (e.g., "34.6 years"). Choose based on your audience and required precision.