Age in Years Calculator

Our age in years calculator can find a person's age from their birthday and calculate the year they were born from their age!

Have you ever wondered how old someone is when they say they were born in 1989? Or did you try to guess someone's birth year from their age? With our calculator, you will be able to:

• Calculate age from birth date;
• Find birth year from age;
• Learn how to calculate age; and
• More about the date of birth calculation!

Calculating someone's age might seem straightforward, but it can get a bit more technical depending on how precise you want to be.

If we assume every month to have exactly 31 days, then we can get someone's age in days with the following formula:

time = (years × 365) + (months × 31) + days

where years, months, and days are the differences between the person's birth date and current year, month, and day.

To calculate a person's age in years:

1. Take the difference between the current year and their birth year: years = current year - birth year.
2. Take the difference between the current month and their birth month: months = current month - birth month.
3. Take the difference between the current day and their birth day: days = current day - birth day.
4. Replace these differences in the age formula: age = (years × 365) + (months × 31) + days. This is the person's age in days.
5. Divide the result by 365 to get the age in years.

For example, if someone was born on July 4th, 1989 and today was July 5th, 2022 following the previous steps would result in:

• Years difference: 2022 - 1989 = 33. Note that this is the person's age if the date we're comparing to was their current year's birthday.
• The months difference is 0 in this example.
• The days difference is: 5 - 4 = 1.
• Putting every difference in the corresponding variable inside the age formula: time = (33 × 365) + (0 × 31) + 1.
• As a result, we get that the person is approximately ≈ 12, 046 days old.
• We can divide by 365 to get the number in years: 12, 046 / 365 = 33.0027 years

Our age in years calculator doesn't only calculate age by birth date. It can also work the other way around!

To calculate the date of birth, simply input the person's age in years, months, and days, and our tool will automatically find their date of birth!

Feel free to check any of our age calculators if you enjoyed this age in years calculator:

• Chronological age calculator;
• Age in weeks;
• Age in months;
• Age in years months and days;
• Age in days;
• Age in hours;
• Age in minutes;
• Age in seconds; and
• Days old calculator.

122 years and 164 days. The oldest person whose age was verified is Jeanne Calment, who lived 122 years and 164 days from February 21st, 1875 to August 4th, 1997.

22 years old. If you were born in 2002 and wanted to find out how old you will be on your birthday in 2024, simply subtract your birth year from the year you're comparing to: 2024 - 2002 = 22.