1. Open Configuration, select Tables.
2. Select Donor Age Analysis Codes.
3. Select New Table Entry.
4. Enter in your Age Groups in intervals that are best for your practices.
    For example:
    For intervals of 10, enter 10, 20, 30, 40, 50 as separate table entries
    For intervals of 5, enter 10, 15, 20, 25, 30, 35, etc. as separate table entries

Once you have entered all of the groups you can now reports on constituents based on these groups. However for a constituent to be included they need to have their birth date defined, otherwise they will show on the report as Unspecified.