I’m often reminded of how, when we were in college, we thought 30 was forever old. I remember how women started wearing those grandma sturdy shoes by 40, if not sooner.
I think quite a few mobility problems that many people assume come with age could actually be much improved using physical therapy and other interventions. I don’t mean you, @cafe9999 , but I do mean my husband who had intermittent foot pain and just kind of assumed he had to cut back on his walking until I practically dragged him to PT a couple years later.
What makes me feel young is being in a local women’s chorus where most of the members are closer to my mother’s age than mine! Plus I love to sing!
Are we talking what makes us feel young or what makes us feel happy? Perhaps they are interchangeable?
I guess, but I can also feel very young and invigorated when I am pissed off. 
Thank you, @abasket. Yes, genetics are surely mostly to blame for my arthritis, and I do miss vigorous exercise (I had my first injury competing with my teen-aged son on who could shovel gravel faster), but I stay active in multiple ways, and my health is great in every other aspect (and I apparently look much younger than I am), so I’m thankful for that. I was struck by, and am happy to hear that so many people on this thread feel young and are content, and pain free too. And yes, @yucca10 I’ve seen a number of physical therapists, and am currently doing warm water aquatic therapy which is heavenly. I highly recommend it!
Driving with the convertible top down, manually rowing thru the gears, wind buffeting your hair, burning fossil fuel, on a beautiful sunny day makes you feel young(er). >:D<
Standing on a ladder two stories above the ground with a paint caddy and a brush in 90-degree sun, smearing Kilz on fibercement trim, then fetching some paint and repeating the process. 
Isn’t it mostly older people who even know how to use a manual transmission car?
But we learned to drive stick when we were young. And if it was anything like my experience growing up, we learned to drive stick or we wouldn’t be able to drive the family car!
And when today’s youth get old(er), then they can tell their stories of what makes them feel young. But in my case, it’s the manual transmission. For the record, my parents had cars with automatic transmissions.
H and I were tired of doctors telling us whatever we had “was consistent for aging.” Instantly, H is now at the other end of the spectrum. If you want to constantly be told you “are very young”, be 59, have cardiac arrest and spend 19 days in cardiac ICU and then go to rehab in a nursing home.
Note: I do not recommend this method, but will definitely say we are the spring chickens
Sending hugs and good karma to you and your husband @sryrstress . Being the spouse/person in charge of making sure your family member in ICU gets the best care and decisions is not something I would wish on anyone.
@BunsenBurner , please wear some kind of safety equipment two stories up. Temper that agility and ability with safety. Or at least get scaffolding instead of ladders. TBI will make one really feel old.
Haha, yes, @MaineLonghorn, in the winter, we play pickleball on the tennis courts. I like to think we’re sharing not usurping. In the summer, however, we play on a drained ice arena. It’s very hard on our feet, but still a lot of fun. And yes, it’s a great sport for middle aged people (especially those if us who are too uncoordinated for tennis), although there are a lot of young tennis and badminton players who also play.
Agreed on the manual transmission. I have a rebel delight in driving stick, when all the friends who know how have switched to automatic. A French student lived with me for a time and adored driving my car, as it gave him a feeling of home. He drove differently however, perhaps more use of neutral.
I am fit, exercise and really have come to appreciate that I don’t have the aches, pains and ailments that many my age seem to have.
I try to get enough sleep – I don’t tolerate lack of sleep well.
I always try to find the humor in something (even if it’s sometimes a caustic/sarcastic sense of humor).
I volunteer for a high school activity, and enjoy interacting with the kids.
Well, there is also hearing younger (by decades) co-workers and other people complaining about aches, pains, and ailments that you have never had to deal with (or just complaining about “getting old”).
I am quite close to a young (early 30’s) woman who is the former music director at our church. She is married to another woman and they live in the city (I live in the suburbs.) My H and I love hanging out with them at fun restaurants downtown. They have also introduced me to a world of professional music, including opera, which I knew nothing about. These two make me feel young! I have a few other young friends from church, as well. I love that these folks enjoy spending time with me!
I like living in a neighborhood with lots of young families, and interacting with the kids. Can’t imagine living in a 55+ community, that would make me feel older.
I feel young when I run up and down the steps in my house a million times a day. I have friends who are dying to move to a single floor house. Not me - being able to bound up the steps to get something I forgot before rushing out somewhere makes me feel young (counteracts the whole forgetting thing, lol!)
I can’t for the life of me understand why women our age resist wearing shorts. I wear them all summer long - jean shorts, khaki shorts, fun pattern shorts, athletic shorts. I don’t have the greatest of legs, but wearing anything longer in warm weather makes me feel old!
But my biggest “feel young” thing is when my kids and their friends want to hang with H and I. LOVE that.
Going to see plays and having coffee at the really trendy coffee bars.