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Talos and the other night lords on the covenant of blood believe that it has only been 700 (iirc) years since the siege of terra. This suggests that the traitor legions aren't by their own perspective 10,000 years old.

It is also possible that some marines who have spent long periods in the warp might be "younger" than records suggest.

If I had a twin in the 41st millennium and I joined the guard whilst he stayed planet side then for every year I spent in the warp I may not be ageing at all whilst my twin is still getting older. Over our lifetimes say a span of 80 years, assuming I survive long enough to be drummed out on an imperial world, whilst records would state that we were both 80 I might have the biology of a man 15 years younger due to my time in the empyrean.