Can this be done?

I have information about a customer (name, address, DOB etc) which i store in an array

Evertime time i save the customer details, i need something to tell me if the person is over 21 years of age...............is there any way to do this.

I have done everything on my project..............EXCEPT this.

I have looked at all the sources i an find...but to no avail.

Do i use something like Date difference or something , please help.

I have come so far only to fail at this hurdle................aaggggghh!


Thanks