At 78 I think 64 is a baby! If you can alter your perception it might open some doors. Try as very gentle PT or class… with others. Maybe you’ll meet others too. Have to work at connectionsp! I’ve had RA pain and too many other issues for decades but I make myself reach out. At 64 I was quite mobile and active - still ran my representative agency full time - I miss that! Still trying to stay in the world, still reaching out. Hard but necessary. Best to you !