I don't really agree. A carbon bike can last for many years if it isn't crashed. Mine has even been crashed and it is going on 7 years. A strong rider in my group has 95K miles on his Wilier with one repaint. Of course components wear at some level. I have a lot of friends with 5-8 year old high mileage carbon and Al bikes who are good riders who appreciate once a decent bike is purchased, its way more about the rider than the bike.