How to create queries that will calculate age from date of birth

[John Spencer]

That blank space for messages helps to determine exactly what you want.
Please try to fill it in with some details.

Age: DateDiff("yyyy",[DOB],Date()) + Cint(Format([DOB],"mmdd")>
Format(Date(),"mmdd"))

A quick and dirty version that is fairly accurate
Age: Int(([Dob]-Date())/365.25)