Age Calculator
To calculate exact age: subtract birth date from current date. Age is expressed in years, months, and days. For example, someone born January 15, 1990 is 36 years old in 2026.
Calculate your exact age in years, months, and days. See days until next birthday, zodiac sign, and total time lived in different units.
Date of Birth
Calculate Age As Of
Age Milestones
| Age | Milestone |
|---|---|
| 13 | Teenager |
| 16 | Driving age (US) |
| 18 | Legal adult (most countries) |
| 21 | Legal drinking age (US) |
| 25 | Brain fully developed |
| 30 | Dirty thirty |
| 40 | Over the hill |
| 50 | Half century |
| 65 | Retirement age (traditional) |
| 100 | Centenarian |
How to Use
- Enter your value in the input field
- Click the Calculate/Convert button
- Copy the result to your clipboard
Frequently Asked Questions
- How do I calculate my exact age?
- To calculate your exact age, subtract your birth date from today's date. Count full years first, then remaining months and days. For example, if born on March 15, 1990, and today is January 24, 2026, you are 35 years, 10 months, and 9 days old. Online calculators handle leap years and varying month lengths automatically.
- How many days old am I?
- To find your age in days, calculate the number of days between your birth date and today. This includes accounting for leap years (366 days) and regular years (365 days). For example, someone born on January 1, 2000, would be approximately 9,520 days old on January 24, 2026.
- How do I calculate age between two dates?
- To calculate age between two dates, subtract the earlier date from the later date. Start by finding the year difference, then adjust for whether the birthday has occurred. If comparing March 15, 1990 to January 24, 2026: 2026-1990 = 36 years, but since January comes before March, the age is 35 years.
- What is my age in months?
- To calculate age in months, multiply complete years by 12 and add remaining months. For someone 35 years and 10 months old: (35 × 12) + 10 = 430 months. Our calculator provides age in years, months, weeks, days, hours, and minutes automatically.
- How do leap years affect age calculation?
- Leap years add one extra day (February 29) every 4 years, affecting day counts but not year/month calculations. If born on February 29, most systems count your birthday as February 28 or March 1 in non-leap years. Over a lifetime, leap years add roughly one extra day every 4 years to your total day count.