[mjudd]

My Martin D18 12-String I purchased for my birthday in March of 1980. Strictly speaking, I suppose it would be that one.

However, the Guild F-20 that I now have in my possession was purchased by my father before my birth; I used it as a kid when I was learning to play and inherited it "full time" after his death six years ago. I think he bought it around 1957 or '58. (The serial number on it tells its age: It was made in '56.) It was new when he purchased it for $85 ..... full retail price, back then.

EDIT TO ADD: All of the guitars in my signature were purchased brand new; so you can see about how long I've owned them. Some of them I've listed the year I purchased as the year it was made because in the case of the Squire and the Mex Strat, I don't know the actual date of manufacture, but I assume close to when I purchased them.