OP back again. I was offline for a week dealing with a parent's health crisis. This sandwich thing sucks, y'all.
But I wanted to check back in with
sincere thanks for all the wonderful suggestions. I'm definitely checking out that master naturalist suggestion, because nature makes me happy. (For the hydroponic suggestion-- I feel like you see me. I finished the outside garden, and moved to obsessing over the inside stuff a couple years ago. Houseplants and hydroponic herbs and lettuces. Just started some strawberries this weekend!)
I will mentally amp myself up for the possibility of starting some kind of organized exercise thing. Living a walkable life has been enough so far, but I know it'll take more as I get older.
And, assuming my aging/ ailing parents don't require all my time, I think I WILL try to start an empty nesters group, and will post about it here if/when I get my act together. We'll call it something better though.