IME browtines length, shape and starting place on the mainbeam are genetic. They will get longer with age and can be a good indicator of age when they are longer. Some areas in the state just have very short browtines. There are pockets in Webb County that will have mature bucks with 1" or so browtines and areas in La Salle County can have pockets of really great browtines. I don't think the buck in the top pic is more than a middle age buck, a 3 yr old. The second pic appears to be the same buck as the first pic to me, but he looks to be a 4 yr old from the way he is standing.