When I did phone support for the fruit company there was a woman who would come back to me time and again with roughly the same issue.
She had some form of extreme palsy, and her kids lived on a different continent.
What she needed, was someone to talk to her as she tried to input her password the 10 or so times it would take her to get it entered correctly.
If she did it herself, she would become unsure that she was using the correct password, and give up because she was second guessing herself.
If she asked a nurse to help, the nurse would need to bail halfway through the process and address some other requirement.
In a separate incarnation, I was helping a 90 year old gentleman, who was providing free legal support for the organisation, to log on to his laptop. We had a 60 day password reset cycle. This gentleman would only attend the office every month. So every other visit required a password reset. He would berate me as he went, like the guy was a massive d bag. But my understanding was that he had chronic arthritis in his hands, so this process was very painful for him.
I think the best workflow would be to use login codes and eschew passwords entirely. Definitely dont have mandatory password resets. I think the initial Passcode enrollment step might rule passcodes out but I have only really dealt with them on the MS side.
That said, you need a really good non password backstop for login codes, because in my experience, elderly people tend to replace phones/numbers/laptops/email addresses quite frequently too. I used to keep a folder in my password vault for my grandmother so I could recover her email/facebook, but not before she ended up with 3 email accounts and facebook pages.
Biometric Authenticator App? IE key recovery / load to a new phone is biometric, but otherwise it just prompts a 6 digit code on login? I think younger generations have a better sense of "I am X, but my email controls Y" where older people are like "I am me, so give me my emails" and something that is unequivocally "Me" like biometrics might be the best way to meet them where they are.
Just my 2 cents.