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Swearin' to God.
Considering his age, you’d think that Frankie Valli is following his own advice and—albeit scarcely—holding onto what he’s got. He isn’t the youngest guy in the biz, so most of the music performed Friday night at a damn near sold-out Ruth Eckerd Hall was transposed a half step or so down, and in the crowd, there were maybe 50 people who still had naturally brown hair (myself included).…