I believe Gable had health issues. He was on crutches and not able to walk.FWIW, Dan Gable retired at age 49.
Wrestling is one of the few sports where the Coach actually works out with the team members. At a certain age or physical condition, the Coach is not able to do that, or is limited. So early retirement is not out of the question.
John Smith just turned 56 and still strong as an ox! Room wrestling isn't full out wrestling. Obviously when people say Cael beats them in the room, they're talking about a 15 second scramble to learn a position rather than a full 6 minute match. In that scenario, who is going to out maneuver Cael? Who probably knows what's going to happen well before it happens.
I think most are aware Cael cannot go the distance at his age against DT anymore for real (though DT always says Cael still is the best) Working through one position obviously is different and I suspect Cael could do that for 15 more years at least.