This last weekend was an important one for us, because when we entered the park through the Big Oak Flat entrance station, P was able to show his ID and purchase a Senior Pass for $10. According to the USGS store that sells them:
A Senior Pass is a $10.00 lifetime pass that provides access to more than 2,000 recreation sites managed by five Federal agencies, with up to 100% of the proceeds being used to improve and enhance visitor recreation services.
It allows him (and anyone with him) to enter any National Park in the USA for free. Plus it qualifies him for discounts on other costs like campground fees. Very cool.
Here’s a link to the FAQs about the Senior Pass. Spread the word.