When you watch fitness content you often hear a lot about 40+ being the end. Sure some things might be harder, like putting on muscle.
I'm in my late 40s and am in a lot better shape than when I was in my 30s. I start cycling in my 30s and barely made any progress. Now I'm cycling crazy distances and getting my wife to pick me up at the next town. I'd ride home but some of the locations it is more a safety thing with the traffic building up later in the day.
I didn't have my bikes during some of the covid lockdowns and ended up running times/distances I never thought I'd be able to do 5-10 years earlier. I wanted to run around the lake I cycle around. I probably could have done it. It was only my small bladder holding me back.
Injuries are a bit of a pain. I really should get my elbows sorted. Mainly so I can throw balls to my son who wants to play cricket.
Getting older you have to change things but being fit isn't impossible. My plan for my retirement is to swim, ride my bike and go for walks. Stretching or yoga as well would be good.
A YouTuber I occasionally watch often mentioned the gym bros aren't the hardcore ones. It is the old man/woman that goes to the pool every morning and grinds out laps.