#3.......it's hard for me to say if this buck is a yearling or not. I'd GUESS 2-3 years old, but antler size depends on more things than age.
Anyway.....in this type of hunting, trophy bucks (older) are often passed up in favor of taking young bucks to thin the herd. A lot of factors figure into the selection; and generally the hunter is instructed as to what buck or bucks he is permitted to kill. It gets pretty complicated, as the hunter responsible for the game on the land has to balance conservation, encroachment of humans, and politics (making sure there are trophies available for important people).
I thought that this sounded nutty when it was explained to me, until I got the opportunity to hunt Roe deer several years ago.
The "master hunter" told me which tree to climb, where the deer would present, which bucks would be there, and which ones I was allowed to shoot.
It went down just as he said and I shot the "correct" deer. It would have been bad if I had overstepped my bounds.
I also hunted on another "reserve" where the hunter (a very good family friend) told me that I could shoot any buck I saw. I lucked into a pretty good one that day.
Another interesting facet of this hunting culture is that the most highly prized buck is the old decrepit one........with short mangled antlers. If you are lucky enough to shoot one, you will receive congratulations from the fellow hunters (even though it will look like **** on your wall).