Being 62 and having had 3 back operations with screws and rods inserted ,here is how I handle this-Most everybody in my room knows that I might be good for 2 games of one pocket or 15-i tell everybody that I will play as long as I feel OK,but I never quit without giving my opponent an equal number of breaks, or 1 more than I get-never have had a problem quitting ahead because I tell all involved the situation before the first game has even started-