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I think the character of Scotty was always meant to be the oldest. He looked like a very old man in The Deadly Years before Kirk and Spock and Kirk says something about Scotty being older in his "captain's log" narration when Scotty falls hard for that librarian "at his age" in Wolf in the Fold.
McCoy always came across as older too. He seemed to have already sewn his wild oats, unlike Kirk, and he talks a lot about the "good old days." Kirk was supposed to be the youngest person to have advanced to captain in Star Flleet at that time - 34.
Spock was probably older than Kirk also, having served for 9 years with Captain Pike. But who knows because he is a Vulcan. Nimoy was previously an actor in Yiddish Theater. Although not as fluent, both Shatner and Nimoy spoke Yiddish. Raised in Montreal, Shatner also speaks French. Both have spoken openly about being subjected to anti-semitism when they were kids. Walter Koenig is also Jewish, as were many of the TOS writers and some of the crew.