Athletically? Peaked about 3 or so years ago. Nothin comes easily any more, but it's much faster to back slide. I can still regain what I lost, but it doesn't take as long to start back sliding it's much harder to "get it back" than to just maintain it in the first place. I don't run for a few days and I feel it right away. Then spent the next 2 or more weeks working back up to that level.
But skill set wise, I'm still growing. Before, I used to find a few things that worked and just beat them to death. Now I have to use my head more. maintaining and increasing my "tool box" is no longer a punch line but a passion.