128 innit? Otherwise your /64 would have no subnets.
Hence my having a /64 (/48 in fact, should I ever enable more than the current /64) shows that 64-bits is enough for global addressing. If it wasn't then giving me a /64 would be part of a path to creating an address exhaustion problem just like the one with IPv4 (which was exacerbated somewhat by handing out /8 ranges unnecessarily in the early days).
No worries, I'm happy to have very slightly reduced the amount of confusion in the world (especially if it might have been caused by my previous message not being as clear as I thought it was at the time of writing!).