I'll soon turn 70 am in great shape, don't wear glasses except to read fine print, and not yet retired although I will be soon. I too think about how long I will be able to drive the motorhome. I just drove it 400 miles two days in a row and did fine but I can tell I am not quite as sharp as I used to be so I don't drive at night if I can avoid it and usually don't drive as long each day as I used to. I don't think there is a specific age when one should quit driving as it depends on the individual but I think it is a good idea to take things a little easier and be aware that we are older and have more limitations than when we were younger. My wife is partially disabled and does not drive the MH so I also worry what she would do if something happens to me on the road. I have seen people that drove too long but also see younger people that are terrible drivers. Hopefully we will know when it is time to hang up the keys or someone will tell us.