Board Thread:Warhammer 40k General Discussion/@comment-6078851-20130130174042/@comment-3580035-20130218060625

Space Marines do age. In one of the Salamander novels, there was a Marine still alive from the Horus Heresy, and had been sitting on a chair for several millenia. The catch was that he literally couldn't move anymore, and was half fused to the chair due to sitting there for so long.