A simple method to calculate age in years in C# and JavaScript. Additional info on the number of days in a year can be found here.
C#
public static double CalculateAge( DateTime birthDate )
{
double daysPerYear = 365.242199;
TimeSpan span = DateTime.Now.Subtract( birthDate );
double age = span.TotalDays / daysPerYear;
return age;
}
JavaScript
function CalculateAge( birthDate )
{
var msPerDay = 1000 * 60 * 60 * 24;
var daysPerYear = 365.242199;
var age = ( new Date() – new Date(birthDate) ) / msPerDay / daysPerYear;
return age;
}
