Spock was born in 2232. He was 34 at the start of the original series. He was 53 was killed to save the Enterprise, and reborn on the Genesis planet. He was 61 when took command of the Gorkon Initiative, to make peace with the Klingons. He was 137 when he left for Romulus to work for re-unification. He was 155 in the recent Star Trek film, when he was sent back in time.