Oldest ones are just over 40 years old now, so the Graftek easily passes the "sniff test" for what's C&V....
BTW, It's highly unlikely that the frame tubes on the Graftek will shatter/asplode from a lateral hit as show in verktyg's pics, as the Gratek frame tubes are actually a composite construction using aluminum tubes, wrapped with CF:

......so it ain't so crispy as people think they are. Sure, maybe still not as strong as Fe or full Al, but certainly stronger than just pure CF.
The glue joints will most likely fail before any tubes break on an owner.....