Temporal Life event based on Participant dependent's age

Hi,

We need to setup temporal life event based on particpant's dependent age. the realtionship type is "spouse".

Whenever this spouse turns 65, i need to trigger a life event on the particpant, to chnage the covergae amount of the spouse life insurance.

Requirment:

Age reduction rule, should be applied on Benefit amount that employee chooses for optional spouse.
  
Suppose an employee is enrollned in Optional spouse say " $100000". In coming september his spouse reahces age of 65 then the benefit amount should automatically reducte to $65000 (65% of what he has chosen). How i can setup this.

Can someone please help?