Most campers have only one or two steps up to the bed. Then you can just lay down or crawl or roll over on the bed once you get leverage. Now getting down for some I would think could be more difficult; but even then you can just sort of lay on your stomach and slid off to the step. Kind of like if you were drunk! :) I'm 56 and have no problem jumping up and down the steps; but I'm in pretty good shape. .
Now "hanging up one's keys".. is different. That means one no longer is driving..
Dak