Popular theory is Captain America is living on a base on the moon.

But...I don't know about gone. He went back to put everything where it was supposed to be, and what I heard is he stayed. And I guess got to try and live through all those decades he felt he needed to catch up on.

[And if he's still alive and kicking, even old, well. Apparently didn't want to seek out all his friends.]

And the musical sucks. Your part's pretty good though. Must've cast an actual gymnast at any rate.