I'm approaching 75 (Hello to all HN'ers who built S-100 home computers.) and my hobbies are mainly piano -- yes, you can improve with age and practice, --- photography --- I live on a ridge with fantastic views, manzanitas all over and rock walls to (almost) climb, --- and hiking (it's a ridge, remember?)
Also chainsawing branches that snapped in the previous winter storms, or which have blocked my hiking paths --- which I created by chainsaw and loppers (great for the biceps).
My "meditation" is chanting and studying the Lotus Sutra (it's emancipating!).
Meals for one are very hard to balance. I try.
Playing piano really is a big mental challenge for me, as I try pieces just short of concert level. I believe that it helps keep me sharp.
It is great that you spend time with friends and family. Distance gets in the way of that, as friends and family are at least 50 miles away.
I have been an amateur photographer for over 50 years, and photography can make you much more observant and tuned in to nature, a great connection to make. Beats hugging trees, which might have poison oak vines circling them. (They often do.) I used a 24-1000 mm (effective) little Coolpix for over 10 years before going mirrorless. It got me up-close and pulled in distant details (and birds). Still does. It's artistic!
I guess that the overall approach is being "in tune".
Hope this helps!