How do you manually calculate age of a person?

Answer 1

Subtract the date of birth from the current date (or date of interest).

Or you can use this online tool to do this :

http://codinganswers.info/webtools/index.php/2011/04/calculate-your-age/

n also

First, take the present date as years,months,days.

Example: 2012,04,13

and next take the date of birth as same.

Example: 1991,05,23

Now subtract it,

2012,04,13

-1991,05,23

------------

0020,10,20

process is 13 is smaller than 23. So, we should borrow 1 month(i.e.,30 days) from left side.

now 30+13=43

2012,03,43

-1991,05,23

------------

20 days

----------------

and next in months 03 is less than 05. so, we should borrow 1 year(i.e., 12 months) from left side.

now 12+03=15

2011,15,13

-1991,05,23

------------

10 months

---------------

and next by subtract years we will get 20 years.

Hence the age according to present date is "20 years,10 months,20 days"... :)

Answer 2

First, take the present date as years,months,days.

Example: 2012,04,13

and next take the date of birth as same.

Example: 1991,05,23

Now subtract it,

2012,04,13

-1991,05,23

----------------

0020,10,20

----------------

process is 13 is smaller than 23. So, we should borrow 1 month(i.e.,30 days) from left side.

now 30+13=43

2012,03,43

-1991,05,23

-----------------

= 20 days

-----------------

and next in months 03 is less than 05. so, we should borrow 1 year(i.e., 12 months) from left side.

now 12+03=15

2011,15,13

-1991,05,23

------------------

= 10 months

------------------

and next by subtract years we will get 20 years.

Hence, the age according to the present date is "20 years, 10 months, 20 days"... :)