I'm curious what is considered elderly. Even my 95 yr old mother, who learned to use a computer at 86, is able to adapt to changes. She would love an Ipad but has macular degeneration and has software that allows her to use a cursor that magnifies up to an unbelievable 32x LOL. Right now she is at 3x but that's considerably larger than anything possible on the Ipad. I have to handle maintenance but she has dealt with OS changes, etc. Just explain the changes which are minimal for the mute button.
I have a lot of apps in my MT bar but have no battery or memory issues so far with my 64GB wifi. OTOH, my husband, with a 32GB wifi, hasn't even tried it (or made folders) but his use of the Ipad is very different from mine. He doesn't use the orientation lock either LOL. I seem to mainly use mine when reading in bed. I don't mind the change to the button at all, may even prefer it to be truthful.
Sometimes people tend to limit the potential of an elderly person. On the other hand, based on years of dealing with lawyers, I have discovered that in most cases they are the most difficult people to adapt to any change. Of course, I don't generalize this concept, and always give them moral support and the opportunity to learn about the changes, but when I notice that they are constantly blocking their minds to adapt, I stop trying.
I do praise the efforts of those who are willing to learn and don't limit themselves due to age, or any other condition.