T-SQL, Calculate Age From Date of Birth

Sometime could be useful calculate age from date of birth.
The following t-sql code shows how could be done it.

datediff(yy, date_of_birth, GETDATE()) -

       (case when (datepart(m,  date_of_birth) > datepart(m, GETDATE()))OR

                   (datepart(m,  date_of_birth) = datepart(m, GETDATE()) AND

                    datepart(d,  date_of_birth) > datepart(d, GETDATE()))

                        then 1

                        else 0

        end) AS AGE

My Two Cents...