Board Thread:Warhammer 40k General Discussion/@comment-18016240-20140707161751/@comment-25177957-20140715043831

Well if you consider Thunder Warriors to be roughly similar to Astartes, then Arik Taranis might possibly be the oldest superhuman warrior still alive by the 41st Millenium, although his recent actions haven't exactly been noted in the lore. He's likely still hiding out on Terra.