To calculate how old someone is, you need their birth date and the current date. The basic method is:
- Subtract the birth year from the current year.
- If the person has not yet had their birthday this year, subtract one more year.
For example, if the current year is 2025 and the person was born in 2005, and their birthday has already passed in 2025, they are 20 years old (2025 - 2005 = 20). If their birthday has not yet occurred in 2025, they would be 19 years old (2025 - 2005 - 1 = 19)
. For a more precise age including months and days, you calculate the difference between the birth date and the current date in years, months, and days. This can be done using formulas or online age calculators that account for leap years and varying month lengths
. In summary, age in years is generally:
- If birthday passed this year: Age = current year - birth year
- If birthday not passed yet: Age = current year - birth year - 1
More detailed age calculations can be done with online tools that provide exact years, months, and days
