User blog comment:NecrusIV/Average age of a Space Marine/@comment-4608429-20120815184347/@comment-4608429-20120815215627

I would like to point out that the world that Salamander was on had been in the Warp for along time before hand. He might have only been alive for 100 years for all we know. And anyway, Cassius is the oldest in the Ultramarines at 400 years old, so it would seem that that's the limit for age.