I wouldn't go ten year old carbon. Not because of any fears of it blowing up, but because that is when they were first hitting mainstream, and they have been refined A LOT since then. New carbon with 105 can be had for not much more than that, which is plenty enough for anyone that needs help with this question.

A friendly example to prove a point: Save Up To 60% Off Carbon Road Bikes - New Fuji Transonic 2.3, Full Carbon AERO Road Bikes with Shimano 105 22 Speeds+ Aero Fast Wheelsets (not trying to get into a BD argument, just showing what can be found with no looking, tis the season for LBS to start blowing out 2018 stock)