I know the hunt for the Fallen is a big part of Dark Angels lore, and I know that a number of Fallen Angels turned fully to Chaos and live full-time in the Warp, where they live forever agelessly. But as I understand it not all the Fallen actually turned to the ruinous powers - plenty of them just turned against the chapter without actually worshipping Chaos.
10,000 years since the Horus Heresy, are there any of these non-Chaos Fallen still around? And if so, how? The Blood Angels are the only chapter I'm aware of being exceptionally long lived, and even the oldest of those (like Dante) are meant to be around 1000. Is there any lore that could support any of these guys still being active (stasis pods, life extension tech, etc)?