Correct that the Golden Age passports are no longer issued, however they are still honored, so if you have one you are "golden". The newer version is the America the Beautiful Senior Passport, must be 62 yrs of age, $10 and is good for lifetime. Those will go away on August 28, and be replaced with America the Beautiful Senior Annual Pasport for $20 and the America the Beautiful Senior Lifetime Passport for $80. The supply of the "going away" $10 passes is very limited, when they are gone they are gone. However I believe the NPS sites and maybe the USGS onine store will issue you a rain check/voucher. The COE sites do not issue a voucher or rain check, when they are gone they are gone. I would advise calling ahead to make sure they have them available before making a long drive to purchase one.