The problem with dating sites is that you don't have those visual clues that give re-assurance or otherwise. How about making a bit of music at care homes etc? It gets you out. Do the dogs sing? Or are there people who want to "give" at such venues but aren't musical, who could walk the dogs during? I know of many instances where a visiting dog is part of the entertainment for old people in care homes.
My solution to enforced retirement was to help at a community radio station which allowed me to record old people talking about life in the old days. Since the station folded, that is now my hobby. I meet people doing it. And I discovered a lot of them loved to talk, it triggered their pleasant memories that would not surface easily otherwise. I gave as much as I took! Now I have something to give to posterity.
http://stroudvoices.co.uk