And this is the progression for the other guy. Barry or Henry. One of them, anyway.
Everybody knows about these two guys. Don't we? One of them was universally regarded as one of the great all-around players in the game - and then, late in his career, he decided to become the home run champ. After never leading his league in HRs per at bat, he suddenly led the NL three years in a row. Beginning at age 37. Whereas the other guy was always known to be one of the great sluggers in the game, and led the league in HRs per at bat no fewer than eight times, beginning with his age 27 season.
Henry and Barry.