I've done a little research on this,since I play legacies and always have an elder or 2 in the house.The capper seems to be 96 days for me,even if they complete the marathon runner challenge.I have no idea why 96 days seems to be my maximum......I play with lifespan on normal,and they all have their athletic skill maxed out....maybe I should try making them vegetarians as well.I have to admit,though,that by 96 days I am pretty much ready for them to kick it anyway.My bad......