It's not even about washing/feeding yourself. I simply don't want to have to work all my life. I'd like to spend my days reading, watching movies, traveling, eating out, etc.

To your question though, I find that as I get older life is increasingly more interesting. I suspect that will be the case regardless of whether I'm hobbled by my body.

Also, if I have grandchildren I can imagine wanting to hang around to see them grow up.