And another...

Select DateDiff(day, @dob, GetDate())/365.25 !

>One more into the ring...
>
>SELECT
>CASE
> WHEN DATEADD(year, DATEDIFF (year, @bdate, GETDATE()), @bdate) > GETDATE() THEN DATEDIFF (year, bdate, GETDATE()) - 1
> ELSE DATEDIFF (year, bdate, GETDATE())
>END
>
>BTW, this comes from the SQL Server FAQ.
>
>-Mike