My CF road bike is fairly young still, just 22300 km on it.
Has been ridden on not very pristine roads and crashed a number of times, but I can't tell it rides any differently and I can see it going for years of hard riding more, provided I don't crash hard enough.
In a couple of years I will be probably treating myself to a new bike, not because there's anything wrong with this one, but just because, well, why not?
Probably a good idea to keep this one for the kinds of races with a higher probability of crashing.