I personally own no bottles that I bought before 2006, because prior to that time I bought when I needed something for dinner, period. Then I discovered this site.
Now I have about 110 bottles, plus two 5-gallon carboys of homebrew yet to be bottled. I am averaging 2-3 bottles a week in consumption. I'm up against two constraints - lack of good cellar space and lack of funds to buy the more cellar-worthy bottles. I have about 30 or 35 bottles of Bordeaux and other French wines, all between $10 and $35, but that's about as high as I'm willing to go without someone standing beside me in the store telling me whether a particular one is a good buy or not. I don't have the years of experience with the unfamiliar names to be a good judge of that myself, unless I happen to see one that I recall being given accolades here on the WLDG. I'd love to have a cellar full of great vintages from good wineries, but it's not going to happen in time for me to be able to enjoy them, I'm afraid (me being the big 50).
So I take vicarious pleasure in reading about the great ones you folks have cellared.