What I find even more disturbing than Trek's suggestion that one should consider scrapping their aluminum bike after 10 years is their suggested service schedule.
"Most bikes need service for every 25 hours of riding time. So, if you ride about three hours each week, you should get your bike serviced every two months."
Based on this, if you ride 6 hours a week you should get your bike serviced every month. I doubt there is anyone who does that. The only Trek I have is from 1983. Thank Goodness its steel!