Benefits Administration Eligibility Table

I am trying to have one of my benefit plans only calculate until 6 months prior to the employee turning 65.  In the Define eligibility table, I thought about adding a line that is the coverage terminates when the maximum months from their Date of Birth is 774...but I can only add minimums with the exception of age.  I thought about using the date code, but the date code is also used for when the benefit starts - example 1st of the month following the line in the eligibility table that has 90 days of service.  Can the date code