Board Thread:Warhammer 40k General Discussion/@comment-25618639-20150723053637/@comment-72.38.238.35-20160905225510

The The Horus Heresy novels address this. They do not age. They can effectively live for all eternity and fight forever as far as far as a combat effective Space Marine can. But, they will die, all Space Marines eventually at some point during their lifetimes will come accross a battle they will not survive. Death to a Space Marine is always a violent one. It is not a matter of if they will die, but when. Be it within 1 year, or be it within 10,000 years.

It is true that they do not age, but they will always die to a lost battle at some point.

The process that changes an ordinary man to a Space Marine is one that renders them able to live forever as far as age is considered, but that is merely a byproduct of the main purpose of them being a warrior.