Free age calculator — find out how old you are in years, months, days, weeks, and hours from any birthday. This birthday calculator shows your exact age and answers "how old am I?" with precise detail down to the day.
Exact age in years, months, days, weeks & hours
This age calculator works by finding the exact difference between your date of birth and any "till" date you choose — defaulting to today for a live "how old am I" answer. Select your birth day, month, and year from the dropdowns, verify the till date (or click "Age till today" to reset it), and press Calculate. The result shows your age in years, months, and remaining days — the most accurate way to express exact age — plus your total age in months, weeks, days, and hours for fun perspective. The calculator also shows which day of the week you were born and counts down the days until your next birthday.
Age calculations have real legal and financial consequences in the US. Social Security benefits can begin as early as age 62 (at a permanently reduced rate), or at your Full Retirement Age (67 for anyone born after 1960) for full benefits. Medicare eligibility begins at exactly age 65 — not 65 years and some months, but the first day of the month you turn 65. For financial accounts, IRS Required Minimum Distributions from traditional IRAs and 401(k) plans must begin at age 73 (raised from 72 by the SECURE Act 2.0 in 2023). Knowing your precise age in years and months helps you plan around these thresholds with confidence.
Most US states allow a learner's permit at 15 and a full driver's license at 16–17. Some states like New Jersey require drivers to be 17 for a basic license. Rules vary by state, so check your specific DMV requirements.
At 18 you can vote in all US federal and state elections, sign legally binding contracts, serve in the military, and apply for credit in your own name. You are also no longer covered by your parents' health insurance (unless they opt to keep you on until 26 under the ACA).
The legal drinking age is 21 in all 50 US states — no exceptions. At 21 you can also rent a car without the under-25 surcharge from most major rental companies, and some states lift additional restrictions on concealed carry permits at this age.
Medicare eligibility begins at 65. Full Social Security retirement benefits apply at 67 (for those born 1960 or later). At 73, IRS rules require you to start Required Minimum Distributions (RMDs) from traditional IRAs and 401(k) accounts — regardless of whether you need the money.