How old is too old?

There will be no consensus. Just like driving a car, you are too old when you feel that by driving, you are a danger to yourself and others on the road. Be honest with yourself and considerate to others about when that time comes.

I'm curious...exactly what are you thinking about when you think ahead to when you can no longer handle your rig.

Hopefully you are living life to the fullest while you can!

You are the only one that can answer your question. I have seen folks stop at 50 and seen some still going at 90.

If you’re thinking about it and wondering, you’re not too old.
Once you start misplacing your RV and wearing your underwear on the outside of your pants, you’ll be too old, but will forget to notice!

Individual capabilities vary. Some shouldn’t be driving at 60.

Everybody is different. The fact that you are asking this question tells me you still have a few left. When you start scaring the DW with your driving, need help parking, then you may need to reconsider what you’re doing.