I'm at 43k on my 2008 now, and I am not worried at all about it. Just keep changing oil and keep up on the maintenance, and it will last forever. I know one guy with 110k on a Gen1. I also know another guy with an old gixxer 1000 with 250k on it.
My last valve check, not a single one was out of spec - and I have never had anything fail.
P.S. - I'm expecting 200k out of this bike, and have no concerns about getting there.