Every car forum has a thread (or series of threads) where people try to convince other members that they're either too young or not financially stable enough to own the forum's target car. Why bother with this argument? It says far more about your opinion of yourself than how you feel about the car or the individual you're attempting to advise. The 370Z is far from an exclusive car so there will be plenty of people whom you don't want to be associated with that will purchase the car. One can only imagine what goes on on a Ferrari or Veyron forum.
"You're only a 25 year old millionaire? I'm a billionaire! Only billionaires over the age of 40 can buy this car..."
That said, the brakes issue rarely if ever manifests itself. The only reason why the brake fade became a forum meme is Car & Driver wrecked a Nismo 370Z due to brake fade. However, their post-crash analysis showed the Nismo 370Z has the same brake fade as a Nismo 350Z, which has a Brembo braking system. See the following articles.
Z Meets Wall: We Investigate Why the NISMO Z's Brakes Failed at Lightning Lap - Feature - Auto Reviews - Car and Driver
The Power to Stop - Tech Stuff - Auto Reviews - Car and Driver
The latter article shows the updated car fares little better than the old car, so I don't see why the idea of the brake fade limit on the 370Z being where it is is such a surprise. The takeaway is should you take your car onto the track be sure to upgrade your brake fluid and install a set of proper brake pads.