Gentlemen, I have wood stacked all over my property and I guess I'm five or six years ahead, mostly red oak, white oak , and hickory. I have been burning some of my older stacks and find that it's not the best wood. After three years or so the bugs have chewed on it and left a bunch of chew saw dust. This gets wet and holds moisture causing the whole stack to stay wet. If I unstack the pile and hit the splits with a wire brush it'll dry in a couple of days and be good. I have burnt some of my three year old stuff and find that is the best. So I guess it's best not to be too far ahead. I turned 70 a while ago and it's natures way of telling me that I'm taking this wood pile thing much too seriously. No need to have too much wood. David.