finally old enough!

There is only one that fits what you ask. It is now called the America the Beautiful Senior Pass. You do not need to be drawing Social Security income to use it, you just need to be old enough and a citizen or permanent resident of the U.S., with identification to establish both. I used my passport as ID to buy mine.

I think it was the Golden Age Passport when I bought it, and one of the National Park entrance gates replaced it with the new one.