"Where can I get a Senior Pass?
You can buy a Senior Pass in person from a participating Federal recreation site or office. See Site Locations that issue the Senior Pass.
You can buy a Senior Pass via mail order from USGS. Mail-order applicants must submit a completed application, proof of residency and age, the $20.00 ($10.00 fee for the Senior Pass, and an additional document processing fee ($10) to obtain a pass through the mail. Once the application package is received the documentation will be verified and a pass, with the pass owner's name pre-printed on it, will be issued to the applicant."
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www.recreation.gov]