Hey, if you are born late to the game, blame your parents, not the government.
I still have 2 years to go to get to eligibility for a senior pass. Even if the senior pass is no longer $10, it is still a good deal as I have paid for 3 annual passes, which were not for a lifetime (they are annual, duh!).
This thread made me curious to see how many National Parks there are. Of the 59 NPs, here are the ones that I have been to.
Acadia, Maine
Bryce Canyon, Utah
Crater Lake, Oregon
Death Valley, California
Glacier, Montana
Grand Canyon, Arizona
Grand Teton, Wyoming
Haleakala, Maui
Hawaii Volcanoes, Hawaii
Joshua Tree, California
Kings Canyon, California
Mount Rainier, Washington
Olympic, Washington
Petrified Forest, Arizona
Redwood, California
Rocky Mountain, Colorado
Sequoia, California
Wind Cave, South Dakota
Yellowstone, Wyoming
Yosemite, California
Zion, Utah
I just recall Waimea Canyon in Kauai, but that was a State Park.
I visited about half of the above through the years, and about half after I retired and bought the annual passes.
Same as the senior pass, the $80 annual pass also lets one into the 2000 federal recreation sites. I did that a few times, like at the Crater of the Moon and Muir Woods, which only get assigned the status of National Monument.