Age Calculator
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How to use
- 1 Enter your date of birth using the date picker, or switch to Manual entry for month/day/year inputs.
- 2 Optionally set a target date — leave blank to use today.
- 3 Click Calculate to get your exact age in years, months, and days.
- 4 Review extras: total days lived, weeks lived, hours lived, weekday born, and your next birthday.
- 5 Set the target date to a future milestone (graduation, anniversary, retirement) to find out how old you'll be on that day.
About Age Calculator
FAQ
Q How does this calculator define age?
Age is the number of complete calendar years between your date of birth and the target date. You turn one year older on each birthday. This is the standard US and international convention used by Social Security, the IRS, the Census Bureau, and the DMV.
Q How old will I be on a future date?
Set the target date to any future date — your high-school graduation, a milestone birthday, or a planned retirement date — and the calculator returns your age on that day. Useful for retirement timing (Are you 62 by then? 67 for full SSA?), insurance eligibility, and planning.
Q What if I was born on February 29?
For non-leap years, US states generally treat your legal birthday as March 1 for age-of-majority purposes (driving, voting, alcohol). The calculator computes your age in completed calendar years correctly using DateTime arithmetic, so you turn one year older once March 1 has passed in non-leap years.
Q When is my Social Security full retirement age?
For people born in 1960 or later, the full Social Security retirement age (FRA) is 67. People born 1955–1959 have an FRA between 66 and 2 months and 66 and 10 months. People born before 1955 had an FRA of 66 or earlier. Source: Social Security Administration.
Q When can I make penalty-free 401(k) withdrawals?
Generally at age 59½. Earlier withdrawals trigger a 10% penalty on top of income tax. Exceptions include the rule of 55 (separation from employer at 55+), substantially equal periodic payments (Rule 72(t)), and qualifying hardships. Source: IRS Publication 590-B.
Q When do I have to start taking required minimum distributions (RMDs)?
Under SECURE 2.0 (2023 law), RMDs begin the year you turn 73. The age rises to 75 starting 2033. The calculator shows your RMD start year based on your date of birth — verify with your plan administrator if you have multiple retirement accounts.
Q How many days have I been alive?
Multiply roughly 365.25 by your age in years. A 30-year-old has lived approximately 10,958 days. A 50-year-old: ~18,263 days. The calculator gives the exact count from your date of birth, including leap day adjustments.
Q When am I eligible for Medicare?
Generally at age 65. Some people qualify earlier due to disability or specific conditions (ESRD, ALS). The Medicare initial enrollment period runs 7 months: 3 months before your 65th-birthday month, the birthday month itself, and 3 months after.
Official resources
SSA — Full Retirement Age table
Social Security Administration table of full retirement ages by birth year.
IRS Publication 590-B — IRA Distributions
IRS guidance on age 59½, age 73 RMDs, and penalty-free retirement account withdrawals.
Medicare.gov — When am I eligible?
CMS official guidance on Medicare eligibility starting at age 65.
US Census Bureau — Age data
US Census Bureau definitions and demographic data on age and population.