Well, I recently had the dubious pleasure of turning 40. As guitar players, we often mark significant birthdays with a special guitar, and that's just what I did :) I just thought I'd show you the three guitars that have marked major birthdays for me:

At 17, I got my Summer job and saved up for this, my Gibson MIII, which was my 18th birthday present to myself.

Then, for my 30th, my first Gibson Les Paul.

And now, finally, for my 40th it's a Gretsch G6120. It's an awesome guitar! They all are actually, but this one seems just extra special :)
I know there have been other birthday guitars on here, any nice ones you want to share with us?