How do I calculate someone’s age based on a DateTime type birthday

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How do I calculate someone’s age based on a DateTime type birthday?
Given a DateTime representing a person’s birthday, how do I calculate their age in years?

Answer
An easy to understand and simple solution.
// Save today’s date.
var today = DateTime.Today;

// Calculate the age.
var age = today.Year – birthdate.Year;

// Go back to the year in which the person was born in case of a leap year
if (birthdate.Date > today.AddYears(-age)) age–;
However, this assumes you are looking for the western idea of the age and not using East Asian reckoning.

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