Hi Ray
As someone with a failing bad back and knees, I know WHERE you are coming from but for different reasons.
I'm still enjoying my differing bikes but have to do half of the things on your list.
I dont think there are many things better than seeing a child share a similar passion to your own...
but
after seeing a few classic racing Ducati's, I think karting and getting an older lady in your garage might be just the tonic you need
Regards - Frank