Good question. Not sure if the USA recognizes non-Americans for this program. 62 is the age. http://store.usgs.gov/pass/senior.html Who qualifies for the Senior Pass? U.S. citizens or permanent residents who are 62 years or older. (You must have turned 62 before you can buy the pass). NOTE: Owning property or paying taxes in the U.S. does not automatically qualify you for a Senior Pass. You must be a permanent U.S. resident, or a U.S. citizen with identification such as U.S. Driver's License, Green Card or U.S. Passport.