First of all to calculate age we need the exact date of your birthday and today's date (time also if need a detailed difference). Today is 10/10/2015 and the exact time is 04 hours 46 minutes and 31 seconds.
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The formula for calculating the time difference between the two dates is a simple subtraction and as with all subtractions we start from the most right unit.
To calculate age between a birth date and a given date is the same as calculating age between today's date and the birth date. The only difference here is that we need to use the given date instead of today's date. Simply follow the steps described above to get the difference between two dates.
If you wish to find a date for a given age, instead of subtraction use addition and the result will be the wanted date.
The seconds difference is 44 (44 - 00 = 44), while we need to borrow one hour to calculate the minutes. Now 03 + 60 = 63, so 63 - 45 = 18 minutes. Because we borrowed on hour, the now date's hours unit will change from 10 to 09 and the difference between 09 and 09 is zero.
Borrowing one month from the leftward unit, we get 17 days (31 - 26 = 05 from August and 12 days from October). Subtracting 01 borrowed month and 08 birth date months from 10 months will produce 01 month difference and the years difference will be 31 (2010 - 1979 = 31) years.