Find out exactly how old you are, in years, months, days, hours, minutes, and seconds. Enter your date of birth and this calculator instantly shows your full chronological age, the day of the week you were born, your zodiac sign, your generation, your birthstone, and a countdown to your next birthday. Want your age on a specific past or future date? Enter that too.
Enter your date of birth. Everything below updates instantly.
Common "days alive" milestones. Approximate age uses 365.25 days/year.
| Days alive | Approximate age | Milestone context |
|---|---|---|
| 1,000 | ~2y 8m | Early childhood |
| 3,000 | ~8y 2m | Middle childhood / 3rd grade |
| 5,000 | ~13y 8m | Early teens |
| 7,300 | ~20 years | Roughly your 20th birthday |
| 10,000 | ~27y 4m | Late twenties, popular milestone |
| 14,610 | ~40 years | Roughly your 40th birthday |
| 18,250 | ~50 years | Roughly your 50th birthday |
| 21,915 | ~60 years | Roughly your 60th birthday |
| 23,725 | ~65 years | Medicare eligibility |
| 25,000 | ~68y 5m | Common milestone calculation |
| 30,000 | ~82y 1m | Approximate US life expectancy |
| 36,525 | ~100 years | Centenarian, exactly 100 years |
Age is calculated by subtracting your date of birth from a reference date. The calculator does this two ways: calendar arithmetic for years/months/days, and exact millisecond differences for total days/hours/minutes.
Chronological age is the time elapsed between your date of birth and a reference date. It's what this calculator computes and what "age" means in legal, medical, and everyday contexts.
Biological age estimates how "old" your body is physiologically based on biomarkers like blood panels or DNA methylation. Two people with the same chronological age can have very different biological ages depending on health, genetics, and lifestyle.
Leap years are handled automatically. Total days are computed from actual elapsed milliseconds, which means leap days (Feb 29) are counted whenever they fall within your age span. Two people born on the same calendar date in different years can have slightly different total-days-alive counts because of how many leap years they each lived through.
| Month | Birthstone | Birth Flower |
|---|---|---|
| January | Garnet | Carnation |
| February | Amethyst | Violet |
| March | Aquamarine | Daffodil |
| April | Diamond | Daisy |
| May | Emerald | Lily of the Valley |
| June | Pearl | Rose |
| July | Ruby | Larkspur |
| August | Peridot | Gladiolus |
| September | Sapphire | Aster |
| October | Opal | Marigold |
| November | Topaz | Chrysanthemum |
| December | Turquoise | Narcissus / Holly |
Zodiac sign, generation and birthstone are the descriptive side of a birthday. If you want the playful side too, the spirit animal quiz matches your answers to one of twelve animals, our compatibility quiz looks at how you pair up, and you can score your warmth and social effort in a few minutes of honest answers.
Common US legal and benefit-eligibility ages. Most are federal; some vary by state.
| Age | Milestone |
|---|---|
| 13 | COPPA threshold / standard social media account age |
| 16 | Driver's license (most states) |
| 18 | Voting age, legal adulthood, military enlistment |
| 21 | Legal drinking age, handgun purchase (federal) |
| 25 | Auto rental without surcharge; House of Representatives eligibility |
| 26 | End of parent's health insurance (ACA) |
| 30 | Senate eligibility |
| 35 | President / Vice President eligibility |
| 50 | AARP eligibility, 401(k) catch-up contributions begin |
| 59½ | 401(k) / IRA penalty-free withdrawals |
| 62 | Earliest Social Security retirement (reduced benefits) |
| 65 | Medicare eligibility |
| 67 | Full Social Security retirement age (born 1960+) |
| 70 | Maximum delayed retirement credit age (Social Security) |
| 73 | Required Minimum Distributions begin (born 1951 to 1959) |
| 75 | RMDs begin for those born 1960+ |
Last verified May 2026. Social Security and IRS rules change. Verify the latest at ssa.gov and irs.gov for time-sensitive decisions.
Enter your date of birth in the calculator above. Your exact age in years, months, and days appears instantly. The calculator uses calendar arithmetic and automatically handles leap years and varying month lengths.
Change the "Age on date" field to any future date. The calculator shows your age in years, months, and days as of that date.
The same field works for past dates if you want to know how old you were on a specific historical day.
Enter your date of birth and the calculator displays your total days alive. It's calculated from the exact millisecond difference between your birth and the current moment, so leap days are counted automatically.
A 30-year-old has been alive roughly 10,950 days; a 50-year-old around 18,250; a 100-year-old approximately 36,525.
The calculator shows the day of the week you were born in the Birth Facts panel. It uses the Gregorian calendar and works for any date from 1582 onward.
A year is not exactly 52 weeks. It's 52 weeks and 1 day, or 2 days in a leap year. That extra day accumulates over time, which is why your total weeks alive doesn't land on a clean multiple of 52 on each birthday.
Western zodiac signs are determined by the Sun's position on your birth date in the tropical zodiac. Each sign covers about 30 days. The exact day the Sun changes signs can shift by a day from year to year, so people born on a "cusp" sometimes identify with either neighboring sign.
Yes. Enter February 29 of your birth year as your DOB. In non-leap years, the calculator uses March 1 as the default age-up date, matching the most common legal interpretation in the US.
A leapling born February 29, 2008 turns 18 on March 1, 2026 in the calculator.
Your half birthday is exactly six months after your real birthday, the day you're aged X years and 6 months. For someone born December 21, the half birthday is June 21.
Half birthdays are popular for kids whose real birthday falls during summer break or holidays.
Yes, for dates after the Gregorian calendar was adopted in 1582 (or in some countries later). Britain and the American colonies switched to the Gregorian calendar in 1752, so dates between 1582 and 1752 in those regions can have a 10 to 11 day discrepancy between Julian and Gregorian.
We built this because the existing age calculators either give you a thin years-and-months result or bury you in genealogy modes you didn't ask for. This one gives you the exact age, the day of the week you were born, your zodiac, your generation, and the countdown to your next birthday, all on the first screen. This site is a part of the ads4good Network.
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