As part of the text classification work that I do I follow the uClassify blog who have just release a new web site called Age Analyzer. which guesses the age of the author of a blog. I plugged in the URL of this site and it guessed me in the 26-35 bracket. This would be flattering if you were to look at me but I find it insulting that my writing is considered this immature. It should have put me in the 36-50 bracket.
My friend Rob Manderson's eloquent prose has aged his Ultramaroon Rises Again blog in the 65-100 range (I'm sure you're not that old Rob). Dan Esparza's Esta Nublado puts him at a very young 18-25, and Bill Brown's New Clarion puts him in the 65-100 bracket while his bblog looks a little more accurate at 26-35.