Nimoy's Spock was much older than when we last saw the character in "Unification". Shatner's character would have to be a Nexus reject or somehow prior to the launch of the Enterprise-B. While I agree that Shatner looks good for his age, he does NOT look any where near Kirk circa Generations.I'd say he looks a lot more "Kirk like" than Nimoy looked "Spock like" in the Kelvinverse films. Of course Nimoy was fighting a serious medical condition and we don't know of Shatner currently enduring any.