Don't worry, they are. Until very recently, the high-time guy in my squadron in terms of C-17 hours was a first assignment Captain (ahead of both the CC and DO).
We just don't have any gray beards anymore, and it's stunning how fast that's changed. I've only been doing this for four years, but when I got to my first squadron, we had a Lt Col chief pilot in the squadron whose career had consisted of five consecutive C-17 tours. He knew everything, or it at least seemed that way to a new Lt, and he spent virtually all his time flying locals with the new kids to get them smart. That doesn't really exist anymore. If we exclude attached dudes and guys up at the Group/Wing, I think the squadron currently has one assigned Major and zero assigned Lt Cols who aren't the CC or DO. There's just no one left.