RE: What's the oldest deer you've taken?
I shot a buck that had worn down his teeth down to nothing. He was the longest deer I have ever seen yet not that heavy like you would suspect from an old worn down buck. I personally think he would not have made it through the winter. His teeth were that worn. He did surprisingly have a good 160" ten point rack on his head though which most deer this old are generally smaller.
Now with his teeth that worn I'm not sure how old he was but I would assume very old. I would guess 10 1/2 + but I believe unless i took the incisors out and got them analyzed that you really can't tell.