Enter the birth year and current year into the calculator to determine the age. This calculator can also evaluate any of the variables given the others are known.

Reverse Age Formula

The following formula is used to calculate the age based on the birth year.

A = CY - BY


  • A is the age (years) BY is the birth year (year) CY is the current year (year)

To calculate the age, subtract the birth year from the current year.

How to Calculate Reverse Age?

The following steps outline how to calculate the Reverse Age using the formula: A = CY – BY.

  1. First, determine the current year (CY).
  2. Next, determine the birth year (BY).
  3. Next, substitute the values of CY and BY into the formula: A = CY – BY.
  4. Finally, calculate the Reverse Age (A).
  5. After inserting the values and calculating the result, check your answer with the calculator above.

Example Problem:

Use the following variables as an example problem to test your knowledge.

Current year (CY) = 2022

Birth year (BY) = 1990