Board Thread:Warhammer 40k General Discussion/@comment-6078851-20130130174042/@comment-3258762-20130217173922

The Primarchs are, for as much as we know, immortal. Astartes can probably die of age, but it is not known since noone has lived long enough to find out if they can die in their sleep.

What Russ meant when he said "for my life is all but spent" is probably not his quote, but a twisted version of it meant to make it dramatic by the skjalds, for only Bjorn knows what he really said and Bjorn does not speak of that day when the Wolf King left him behind.