Yeah, that is me, tomorrow, April 12, 2008. No, I do not feel it. But I know that I will no longer be able to consider myself unequivocally "middle-aged" (and I remember thinking that being middle-aged was not so great).
I note for those who are interested that 60 is the Big One in Chinese Taoism, where the usual 12-year cycle of years being associated with animals (this is the Year of the Rat, my year) is compounded by there being 5 of these, each associated with an element, like earth, air, water, and fire (do not remember what the fifth one is for the Chinese). So, the whole thing comes back around after 60. Indeed, each of the 60 years has a specific deity associated with it. I saw all 60 depicted in a Taoist temple in Souzhou, China a few years ago, some smiling, some ferocious, most looking pretty human, but some rather fantastic. Anyway, there are 60 of them, and the one I was born under is back again.