Do you already have code for this (naturally, not all of it, or you wouldn't be asking) but my question is... have you started the project?
The layout of how I would go about it, is I would make a query for the birth year, and then retrieve all the information about each record for that birth year.....so, if they search by 1979, the database would return a list of records for 1979. Then I would store all the information in arrays for every record in 79, and sift through it in the vb code..... let me know where you are with this, and where I can help.