Mid 20s.
The new Kirk was still an Academy student, wasn’t he? He had never served on anything anywhere. Never been in space, that I remember seeing in the movie. No experience with ships or tactics. Never served under a good or bad commander. Just a rebellious “maverick” with a chip on his shoulder, like a taller Tom Cruise, who doesn’t need experience, training or anything. Because, after all, he’s a genius.
Will Spock be his “Goose”?