https://www.nps.gov/planyourvisit/passes.htm#CP_JUMP_5088578
The senior lifetime passes are still available:
Senior Pass
Cost: $80 Lifetime Senior Pass
$20 Annual Senior Pass
Available for: U.S. citizens or permanent residents age 62 or over. Applicants must provide documentation of age and residency or citizenship.
How to purchase: In person at a federal recreation site (see PDF list of federal recreation sites that issue passes)
Onlinebuy the lifetime pass or the annual pass online now through the USGS store!
Through the mail using this application form (PDF).
NOTE: There is an additional cost of $10 for passes purchased online or by mail. See more information about changes to the Senior Pass.
Then I may be wrong. My info was from local radio last week discussing the fee increase for RMNP and several people said they did away with the lifetime passes.
That made sense to me, everything seems to end just before I am able to take advantage. Started with the gas rationing just as I was getting my license.
Were the older passes limited? Does not indicate that anywhere.