My palm is about the same height as yours is. I just got it. They sell them at pretty cheap prices at that height on the east coast, so Im going to guess that they are much faster growing here (but still slow growing palms). Mine are about as sliver as yours. I saw some silver saw palmettos right outside of Magic Kingdom in Orlando, Florida and they were more silver than any palm I have ever seen (even more silver than Bismarkias). Im wondering if they gain there silver color with age, or if its just in the genes.

Your palm looks really nice though! They love humidity, but they handle drought well too (in some parts of their native habitat they get burned by fires almost yearly which is why I would suspect that they are pretty fast when it comes to growing a new crown). Good luck! Thanks for sharing!
-Alex

Nice palm. I like the blue leaves. I have a blue med fan palm that looks similar