using System;
 
public class Test
{
  private static int CalcAge(DateTime now, DateTime bday)
  {
    int age = now.Year - bday.Year;
    if (bday >= now.AddYears(-age)) age--;
    return age;
  }
 
  public static void Main()
  {
    Console.WriteLine(CalcAge(new DateTime(2003, 2, 28), new DateTime(2000, 2, 29)));
    Console.WriteLine(CalcAge(new DateTime(2003, 3,  1), new DateTime(2000, 2, 29)));
    Console.WriteLine(CalcAge(new DateTime(2004, 2, 29), new DateTime(2000, 2, 29)));
  }
}

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