About this tool
Why use this tool
Knowing your exact age — down to months, days and hours — is useful for many practical situations: filing precise government paperwork, tracking a baby's development in weeks (pediatric standard until age 2), verifying eligibility for age-restricted benefits (Social Security full retirement age is 67 for those born 1960 or later, Medicare eligibility at 65, penalty-free 401(k) withdrawals at 59½, alcohol purchase at 21). It's also handy for milestone celebrations and estate planning.
How it works
The tool computes the exact difference between your birth date and today, breaking it into complete years, months and remaining days. It handles leap years automatically (every 4 years, except centuries not divisible by 400). Total hours are calculated using the average 24 × 365.25 days per year, matching NIST's standard time reference.
Real example
Someone born June 15, 1995, calculated on July 10, 2026, is exactly 31 years, 0 months and 25 days old — approximately 271,756 hours or 11,323 days. This precision matters for verifying 401(k) rule of 55 eligibility (must separate from employer in or after the year you turn 55), Social Security early-retirement election at 62, or determining Medicare Part B enrollment window (3 months before/after your 65th birthday).
Practical tips
US federal age milestones to remember: 16 (driver's license in most states), 18 (voting, military enlistment), 21 (alcohol, handgun purchase federally), 25 (car rental without surcharge), 26 (leave parents' health insurance under ACA), 50 (401(k) catch-up contributions), 59½ (penalty-free retirement withdrawals), 62 (earliest Social Security), 65 (Medicare), 67 (full retirement age for those born 1960+), 70 (max Social Security delayed retirement credits). For anniversaries: 25 years (silver), 50 (gold), 60 (diamond).
Disclaimer
This tool does not replace an official birth certificate, the only legally recognized document. Time zones are not factored — use your birth city's local time. For official age verification, request a certified birth certificate from the vital records office of the state where you were born. This is not legal or financial advice; consult the SSA at ssa.gov or a licensed financial advisor for retirement planning.