The Age data is unfortunately not provided each year with the harvest data. That would be awesome if it was.
I have to believe that out of 53 harvested animals for the South unit last year, very few of those bucks were "trophy" caliber.
The year we hunted 7 days, it was very interesting. One pair of guys were on foot and were going after a buck that had just crossed the road in front of us. It was probably a 140" buck, maybe. My dad didn't bat an eye at it as it stopped for photos and then trotted away. Then here comes these two guys in orange, heads down, obviously tracking it. It hadn't been hit, but we thought they had maybe shot at it and if not, they were definitely after him. They waited for us to drive away before continuing after him. A 140" buck. ???
From Saturday to Tuesday we only saw 4 hunting-groups. Wed and Thurs we didn't see another soul around anywhere, and we were covering a lot of ground. Seemed like those groups had either killed trophies already, or they had settled and taken smaller bucks and left. I know for a fact that one of the groups killed a 3-point on the second day (a DWR officer told us so). It was not a giant 3-point either. The DWR officer expressed some humor that they had killed that buck and indicated it wasn't worth the tag. So I know plenty of people who kill "lesser" bucks out there.
It's a double edged sword these days, I think, on any LE unit. No matter where you end up hunting LE, you feel obligated to "kill something" since you waited a minimum of 9 years (archery Book Cliffs). Unless you lucked into an LE tag, in which case, you realize there is a wait period and a high unlikelihood of you ever drawing a tag there again, in which case you still feel obligated to "kill something".
The Book Cliffs sees more of this because there are more tags there than other units. But don't think it doesn't happen on other units. Even the Henry's.
"Therefore, wo be unto him that is at ease in Zion!" 2 Ne. 28: 24