# How to Calculate age from Date of Birth (DOB) edx 152 Points 41 Posts I have user's birthday in datatime object format, how do I calculate their age in years? Views: 8907 Total Answered: 4 Total Marked As Answer: 0 Posted On: 27-Mar-2019 02:45 beginer 294 Points 82 Posts You can try easy and simple way: ``var today = DateTime.Today;// Calculate the age.var age = today.Year - birthdate.Year;// Go back to the year the person was born in case of a leap yearif (birthdate > today.AddYears(-age)) age--;`` Posted On: 30-Mar-2019 00:25 Rashmi Member 206 Points 38 Posts Use following code: ``private static int CalculateAgeFromDateObject(DateTime dateOfBirth)  {      int age = 0;      age = DateTime.Now.Year - dateOfBirth.Year;      if (DateTime.Now.DayOfYear < dateOfBirth.DayOfYear)          age = age - 1;        return age;  }  `` Posted On: 30-Mar-2019 00:28 Jak Member 404 Points 167 Posts Here is another solution to calculate the years, months and days for given date of birth: ``DateTime dateOfBirth = new DateTime(1990, 3, 11);DateTime currentDate = DateTime.Now;int ageInYears = 0;int ageInMonths = 0;int ageInDays = 0;ageInDays = currentDate.Day - dateOfBirth.Day;ageInMonths = currentDate.Month - dateOfBirth.Month;ageInYears = currentDate.Year - dateOfBirth.Year;if (ageInDays < 0){    ageInDays += DateTime.DaysInMonth(currentDate.Year, currentDate.Month);    ageInMonths = ageInMonths--;    if (ageInMonths < 0)    {        ageInMonths += 12;        ageInYears--;    }}if (ageInMonths < 0){    ageInMonths += 12;    ageInYears--;}Console.WriteLine("{0} years, {1} months, {2} days", ageInYears, ageInMonths, ageInDays);`` Posted On: 02-Apr-2019 07:33 edx 152 Points 41 Posts Here is one more method to calculate the age by considering the leap year: ``public int CalculateAge(DateTime dob){    int age = 0, dayofyr = 0;    if (DateTime.IsLeapYear(dob.Year) && dob.DayOfYear >= 60)        dayofyr = dob.DayOfYear - 1;    else        dayofyr = dob.DayOfYear;    age = DateTime.Now.Year - dob.Year;    if (DateTime.Now.DayOfYear < dayofyr)        age--;    return age;}``   Posted On: 07-Sep-2021 02:52