You wish you’d learned to surf / wheelie / snowboard before you were 50 becasue you notice strength going a bit. And your hair goes a bit, too.
(But you listen to new music because the kids have got fire if not always skill, and you’ve heard the old stuff 100 times before)
And since you’ve had so much “stuff” in the past, new toys don’t do it in quite the same way as they used to.
And you remember lost opportunities with regret rather than anger.