string day = "04";
string month = "11";
string year = "1982";
var birhDate = DateTime.ParseExact(String.Format("{0}.{1}.{2}",day,month,year), "dd.MM.yyyy", System.Globalization.CultureInfo.InvariantCulture);
var age = Math.Truncate(DateTime.Now.Subtract(birhDate).TotalDays / 365);
return age;