Juan Marichal question

I was looking at some Juan Marichal cards tonight and more specifically his 74 Topps card(great card). I flipped it over and looked at some stats and it appears he broke into the majors in 1960. Guys like McCovey , Yaz , Brock, and Billy Williams broke in at similar times and played into the very late 70s. Juans last card was in 1974. Does anyone remember the particulars on why he retired earlier than the rest.
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Ron
Buying Vintage, all sports.
Buying Woody Hayes, Les Horvath, Vic Janowicz, and Jesse Owens autographed items