He does suffer from "performance problems", but like some other men don't realize there are other ways to please a woman than just intercourse. He uses his age as an excuse, but I know from all the stories I've heard from friends that worked in nursing homes.
On the other hand, most of the guys at my shop(Not me luckily)have to do something special just to get some lovin' once a month. And IMHO, the woman being the one not wanting frequent sex is the case 80% of the time, especially in couples 40 and younger.