Age Calculator
Find your exact age in years, months, days — and more. Instantly see how many days until your next birthday.
Your Age
How to Use the Age Calculator
Using our age calculator is simple. Enter your date of birth and optionally choose a target date (it defaults to today). Click "Calculate My Age" and you'll instantly see your exact age broken down into years, months, and days — plus a full set of fun statistics about how long you've lived.
What This Calculator Shows You
- Exact age in years, months, and remaining days
- Total days, weeks, months, and hours you've been alive
- Days until your next birthday — great for planning!
- Day of the week you were born
- Your zodiac sign based on birth date
How Age Is Calculated
Age is calculated by comparing your birth date to today's date (or a chosen date). The calculator accounts for:
- Varying month lengths (28–31 days)
- Leap years (February 29 birthdays)
- Whether your birthday has passed yet this calendar year
Common Uses
- Verifying your age for legal purposes (driving at 16, voting at 18, drinking at 21)
- Calculating age for Social Security and Medicare eligibility (62, 65, 67)
- Fun birthday countdowns and milestone tracking
- Genealogy research — calculating ages of relatives from historical records
- Checking if a dependent qualifies for tax purposes (under 19, or under 24 if a student)
Frequently Asked Questions
Exact age is calculated by finding the difference between your birth date and the target date. The calculator counts full years first, then remaining full months, then remaining days. It correctly handles leap years and months with different day counts.
In the United States, the age of majority is 18 in most states and for most purposes. However, the legal drinking age is 21 nationwide. Some states have different rules for specific activities like gambling or renting a car. Full Social Security retirement benefits begin at age 67 for those born after 1960.
Our calculator shows your total days lived instantly. As a rough guide: at age 20 you're about 7,300 days old; at 40, about 14,600 days; at 65, about 23,725 days. Enter your birth date above for your exact count.
If you were born on February 29, the calculator uses February 28 as your birthday in non-leap years for age calculation purposes — which is the standard convention used in most jurisdictions in the US.