Now this bike looks like a couple levels higher than the Felt 35 you were looking at (in the other post).
https://www.bikeradar.com/reviews/bi...ro-3-0-review/
I'd have no problem buying a secondhand carbon bike - and the idea of a "shelf life" of aluminum to me is incredibly overhyped, none of that would concern me. Nobody is riding over cobblestones daily.
Just carefully inspect the frame for any cracks. It is very hard to tell from photos, but the chances are much much more likely anything you see is purely cosmetic. This is the sort of thing you'll quickly see in person, and after speaking with the seller, it's always been obvious (to me at least) when someone is trying to fool you. It's rare.