It's still $10 for a lifetime! The only thing that has changed is the name.
Senior pass information.

I discovered that I also get the 50% discount on Olympic National Park's backcountry camping fee.

There was a move about a year ago to reduce the 50% discount for camping, which is why the weasel-word language in the description of "amenity fees." I understand there was enough comment adverse to the change that this issue is dead for now. I suspect it will pop up again! Personally, I wouldn't mind a reduction to, say, 20%, but I very seldom camp in campgrounds! There are a few concessionaire-run places that won't accept the Senior pass even for parking, such as Lost Lake near Mt. Hood, so I go there only in the off season (it's beautiful, lonesome and free in October!).

Nearly all my use of this pass (about 98%) is as a substitute for the NW Forest Pass.