Wow, thats a tough one. Ive been hunting since I was 9 years old and bow hunting since I was 10, mind you it was small game at the time. My first deer ever killed was a mature 8 pointer that was 3.5 + years old. I shot it with a 270 when I was 11. To count the number of mature bucks ive taken would be a tough task. This year I bagged two. Last year not a one. Year before that two, before that 1, before that 1, before that 1, . That is about as far back as I can remember.
As far as targeting one, never. I dont own any cameras or the likes. I scout the herd and note its movement and hunt the hot spots. Only time i ever target a single deer is during spot and stalks.