An Unhealthy pH Level. Tooth decay can occur when the pH level in the mouth is 5.5. For reference, the neutral level is 7.0. When we consume acidic foods and drinks, the pH within the mouth decreases and can cause the pH in the dental plaque to fall rapidly below 5.0.
Plastic Golden Age Passports are valid for a lifetime. However, if you do want the new Senior Pass, you may purchase one for $10, with proof of identification (e.g., driver's license, birth certificate, or similar government-issued document).lastic Golden Age Passports are valid for a lifetime. However, if you do want the new Senior Pass, you may purchase one for $10, with proof of identification (e.g., driver's license, birth certificate, or similar government-issued document).
The new pass program was created by the Federal Lands Recreation Enhancement Act, which Congress authorized in December 2004 and replaces the Golden Eagle, Golden Age, and the Golden Access Passports as well as the National Parks Pass. Existing passes will remain valid until expired.