DateTime today = DateTime.Today;
DateTime birthday = DateTime.MinValue;
DateTime.TryParse(age, out birthday);
string actual_age = string.Empty;
if (birthday.DayOfYear <= today .DayOfYear)
{
actual_age = (today .Year-birthday.Year).ToString();
}
else
{
actual_age = (today .Year-birthday.Year- 1).ToString();
}
Hope it helps.