Have you tried this?
I don't know you'd be interested, but have you tried either aquasize or yoga? I've aquasized in the past and I loved it, it's very easy on the joints, and if you find a senior class, lots a great stories, just don't take their excersize spot! As far as yogo goes, my aunt has had surgeries on her feet, a hip replacement and a list of other problems all stemming from compensating from trying deal with her feet issues/pains. She 76 and does yoga everyday. Good luck, I hope you find something that'll work for you!