When to quit.

Just curious how many of you who are still RVing past 75 and how many of you have quit or are planing to; partly because of age but mostly age combined with physical or mental deterioration? We have RVed(motor home now, following pop-ups and a small 5th wheel) for over 40 years. So far so good with driving (short days), vision and general ability but a urinary infection on the road on our last trip really stressed us out. So we know we eventually should quit and don't really want to wait until something forces us to immediately. Also, do you ever feel like "been there and done that" so have some doubts about embarking on a trip? I know there's no definitive answer but still interested in hearing.