This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
I have never heard of an age column in database, this is the first time! It is either a poor database design or I am missing something.
Anyway I would recommend you to consider your design. Just have the date of birth column instead of age. Or should you please inform about your age column and purpose, since I am curious about it.