The things we can't do anymore

I'm watching a baseball show, and I feel like I'm on a see-saw.  I love it.  They got so many little details right; you can tell they care about authenticity.  The sounds, the strategies, the mental game, the game itself: I love these things so much that it hurts to watch them because I can't (and probably never will be able to) do them anymore.  It hurts a lot because I didn't expect to feel this loss until I was old.  There's those expectations again; they smash us flat sometimes.