Who Knew Men Had Biological Clocks

I found this article today in the New York Times: http://www.nytimes.com/2006/06/06/health/06sper.html?_r=1&oref=slogin

With all the talk of womens' biological clocks, it is nice to see that scientists are studying mens' biological clocks too. To all the men who are reading this article, now you have an inkling of how us women feel everytime we read about our ticking clocks.