As they say: age has its privileges. AARP also offers a good rate at Hilton Hotels. Generally the rate is as good as AAA but it includes late check-out (when available, of course but I've never been refused). Then again, I am, like you, a Hilton HHonors Diamond Member; so that would probably do the trick too. AARP rate at Hilton is not as good as Advance Purchase rate but it is fully refundable and useful for those 'will I, won't I?' stays.