I have a little bigger and longer running data set, my shed antler collection. I dug into the records last night and this morning. Here is what I found. The collection has shed antlers from 63 different top end MT. bucks from the 70's through the 90's. I or someone I know found at least two years worth of quality antlers from 39 of the 63; or 61%. When you bump it up to three years worth of quality antlers the number of bucks falls to 27 of the 63; or roughly 43%. In this century I have found antlers from 19 top end bucks, with 2/3's of those being in the first five years of the century. Two years worth of quality antlers were found from 7 of the 19; or 31% and I couldn't find three years worth of antlers from any of the 19 bucks. As you have stated, there are still some bucks living longer. I have seen them and found multiple years worth of their antlers even in recent years. Most have been on private, but some have been public land bucks. Old bucks are out there, just not old bucks with even nice antlers. The number of top end bucks that are living long enough to grow and shed two good sets of antlers has crashed in the last 20 years. Top end bucks older than that are unicorns. We are absolutely selecting the top end bucks out of the herd at a relatively young age. The antler collection also indicates potential is reached at around age 6. Today in SE MT virtually none of the top end bucks are reaching that age, unless they are spending the season on private land that is not hunted.