Alter anhand des Geburtstages ermitteln.

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/// <summary>
/// Gets the age of eg. a person from its birthday.
/// </summary>
/// <param name="birthday">The birthday.</param>
/// <returns>The age in years.</returns>
public static int GetAgeFromDate(DateTime birthday)
{
	int years = DateTime.Now.Year - birthday.Year;
	birthday = birthday.AddYears(years);
	if (DateTime.Now.CompareTo(birthday) < 0) { years--; }
	return years;
}