When I was 71 I spent a year with a 39 year old GF who was a true nympho. She could never cum enough. I took weekly T inj., daily Cialis, Cabergoline, Arginine, and handfuls of lecithin just to keep up. After she came she then jerked off several more times so she could fall asleep. I could never get a full nights sleep with out her waking me up with a BJ while she diddled herself. Same thing driving on long trips.
Now all is back to normal life with a new wife. Once a week would be rare.