For Age-Based benefit rates, when an employee moves from one premium range to another on their birthdate, the premium on the benefit/deduction summary window updates automatically. However, for SPOUSAL benefits based on the Spouse's birthdate, those rates do not update. A user has to remember to go into the benefit window where it will then show the correct premium and save it.

I'd like to suggest that all age-based benefits should update automatically, assuming of course that the spouse's birthdate is in GP.

This post from 2012 (!!) has some more details and info on this and how it works for the employee side. Update Age Based Employee Procedure - Microsoft Dynamics GP Forum Community Forum