Yeah, I was stronger and felt better in my mid to late 30s than I'd ever felt at a younger age, and would sometimes go out clubbing and then hit the gym on no sleep and still push out personal bests...
Even my 18 year old self would have killed to feel like that.
But at 30 I couldn't walk a flight of stairs without pain, went to my doctor and was handed an exercise sheet for retirees and told off, and that was what finally got me to address my health, so there's still time to fix it for anyone who feels like that and still time to reach heights of strength and energy you didn't know we're possible.
I lapsed for multiple years in my early 40s, but even with that, after being back in the gym for just a few months I'm still for the most part, apart from a bit slower recovery, feeling better today at 48 than I did at 30, and I'm far stronger and with better endurance (though I still feel weak because I know how much I have lifted, and while Im easily at 5x+ the strength I had at 30, I am so far only back up to 60% of my peak)