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Dwight Evans was 29 when he suddenly became a top slugger. From 1972-1980 he was a middling hitter with a good arm; from 1981-1989 he had patience, power and one of the strangest stances ever.
I can't think of anybody else before the 1990s with a career like that. Since 1990, there've been lots: Terry Pendleton & Tony Phillips were both defensive specialists who turned into offensive forces after changing teams. I suppose you have to have serious defensive value to stay in the majors as a weak hitter until you're 30. I used to think it was coaching, & remembered Lloyd Moseby & Willie Upshaw improving years after making the majors - but those 2 were 23 & 26 when they had their breakthrough years, and faded quickly.