As far as this stated 20% survivng.... They are the youngest of the legal AR buck to be shot, with the exception of a very few 1 1/2 year olds with good genetics... so yes, the younger the deer the higher likelihood of being able to outsmart them thus a higher percentage will be killed.
Maybe you misunderstood my post. I said the antlered buck study showed only 20% of the 2.5+ buck survive hunting season. That is the same survival rate as for 1.5 buck before ARs were implemented.
Who has the stats on the percentage of 4 year old buck being harvested? The number isn't too high being the deer pop is low and few live to be that old. Most are shot as barely legal AR buck before they get that old.
The PGC has the data ,but they won't release because they don't want to admit that ARs failed to produce the predicted results.