Is this really true of superstar players?
Specially them, it could be harder to peak at 22 if you enter the league at ~21 and do not get Full time Top 6-first PP units role right away.
Howe-Lindros-Yzerman-Crosby-Malkin-Ovechkin-Lemieux-Gretzky-McDavid if covid year and the 153 pts one end up being the big ones, it is not uncommon for superstar to have their biggest season in that window. Some will be later at 27 (P.Kane-Beliveau B.Hull).
Jagr it depend how one feel about the 62 goals 149 pts season versus 1999 if he peaked at 23 or 26 but that around that time, he did stay full-elite and relatively close for a long time too.