http://www.nps.gov/findapark/passes.html
According to the U.S. National Park Service site the Golden Age Passes are no longer sold but will still be honored.
"NOTE: Golden Access and Golden Age Passports are no longer sold. However, these passes will continue to be honored according to the provisions of the pass."
Apparently the Golden Age Pass and been replaced by a Senior Pass. I wonder what the big difference is. Maybe I won't worry about it for another year until DH is 62. Who knows what may be changed by then? :h