Chuck didn't start MMA until he was 28 though, Nog started when he was 22. Both mens careers actually followed a very similar pattern in terms of how long they lasted at the top, Chuck started slightly earlier and dropped off slightly earlier, he was already on the decline by the second Tito fight IMHO which wasn't anything like as dominant as the first.
Lets not forget as well that a ton of "well preserved" fighters who've lasted well into their late 30's have either been caught or have legally been on PEDs, Randy, Hendo, Anderson, Vitor, etc.