Buy your $10 lifetime National Park Senior Pass before it's too late

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60. From your link, you can pay $60 a year for a Yosemite pass

And there are other passes available:

Other Passes

These passes admit the pass owner and any accompanying passengers in a private car.

Yosemite Pass: $60
Annual pass providing free entrance to Yosemite for 12 months from the date of purchase
America the Beautiful—National Parks and Federal Recreational Lands Annual Pass: $80
Annual pass covering entrance and standard amenity fees for national parks and other federal fee areas. This replaces the National Parks Pass and Golden Eagle Pass.

Annual 4th Grade Pass: Free
Annual pass covering entrance fees for 4th grade students for 2016-2017 school year.

Annual Pass for US Military: Free
Annual pass covering entrance and standard amenity fees for all active military personnel and their dependents. (For active duty military personnel and dependents with proper identification (CAC Card or DD Form 1173).)
Access Pass: Free
Lifetime admission and discount pass for US citizens or permanent residents with permanent disabilities. (You can also get this pass by mail for $10.)
Senior Pass: $10
Lifetime admission and discount pass for US citizens or permanent residents who are age 62 or older.(You can also get this pass by mail for an additional $10.)

I suspect Yosemite is so expensive because it tends to be overcrowded during the summer season and that is a way to cut down on the numbers.