Age in years with decimal precision given a datetime

Question

How can I get the age of someone given the date of birth in a C# datetime.

I want a precise age like 40.69 years old

Answer 1

This would be an approximative calculation:

 TimeSpan span = DateTime.Today.Subtract(birthDate);
 Console.WriteLine( "Age: " + (span.TotalDays / 365.25).toString() );

BTW: see also this question on Stack Overflow: How do I calculate someone’s age in C#?