That's a bad moment

"When you're young, your potential is infinite. You might do anything, really. You might be Einstein... you might be DiMaggio.

Then you get to an age when what you might be... gives way to what you have been.
You weren't Einstein.
You weren't anything.

That's a bad moment."

Charles Hirsch "Chuck" Barris in 'Confessions of a Dangerous Mind' (2002) George Clooney