There’s no age where it’s too late to start and no age where you’ve earned the right to stop.

Both halves of that are uncomfortable in different ways. Being behind is mostly a story about a schedule nobody actually wrote down, and beginning at any point still beats not beginning. Being ahead is not permanent either, because the work does not stay done.

If you have been telling yourself you missed the window, pick the smallest entry point and take it this week. If you have been coasting on something you did a while ago, choose one new thing to be bad at. Both directions start the same way.