Board Thread:Warhammer 40k General Discussion/@comment-25618639-20150723053637/@comment-99.160.190.145-20150729011626

So far Dante is the longest living astartes not incased in a dreadnought, that honor goes to Bjorn. but since Bjorn is a Dreadnought his life could go on and on..........untill the knowledge to repair his systems is lost or destroyed in battle ..maybe another 10k + years

so in a way they could become"immortal"  if you consider a dreadnought a space marine..