It's a marathon, not a sprint.

Yep, both Spock and Bones are older then Kirk and I adore that. Though Spock doesn't count as much considering. But McCoy's canon was always that he went through med school, got married, had a kid, got divorced and had an early mid life crisis and joined starfleet. Which is why I love him. He's like Hawkeye in space, only having his commission (which if you watch carefully in the movie it's already a Lt. Commander b/c of the extra degrees) b/c of the Dr. in front of his name. *glee*