Run VB Functions in SQL Code?

Hi guys, my first real database program and I'm just stuck on one thing:

I have a table that has a generic birthdate for each member in the format mm/dd/yy. I have a vb function setup to do an age calculation based on today's date called Age(). How do I go about making sql use the function?

You cannot use user functions in SQL. Sorry.

ns-code is right.... SQL itself cannot call VB functions, or C or C++, or C#.... or Java....