/C#/How do I calculate someone's age based on a DateTime type birthday?

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

// 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--;

Source: stackoverflow.com

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

public int GetAge(DateOnly birthDate, DateOnly today)
{
    return today.Year - birthDate.Year + (((today.Month << 5) + today.Day - ((birthDate.Month << 5) + birthDate.Day)) >> 31);
}

Source: stackoverflow.com

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