I know more people who have had problems with aluminum than carbon fiber...
In 2009, I sold a carbon frame that I purchased in 1994. As far as the buyer and I could tell, the frame was as solid as the day it was purchased.
My current carbon fiber frame (2008 Cervelo RS) has almost 15,000 miles on it. I've been hit at low speed by cars twice and the frame is undamaged as are the carbon fiber fork and handlebars. This frame feels much more solid than the one from 1994, so I expect that it will last just as long if not longer!