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6 Rookies? Whooooo....tough one. will have to check that out.
'69 Mets (who I cut my teeth on) had not starter older than 26 and only one guy in the rotation older.
Seaver, Koosman, Jones, Kranepool, Boswell, Nolan Ryan, Tug McGraw, Amos Otis...all on that team all younger than 26, IIRC.
Put lots of precocious talent on the same team and, generally, a bunch of it gets better.
Nice place to be.