In the end i guess it all depends on the persons ability to manipulate and see things.
I've pushed my parents hard into the Apple ecosystem and it has worked out great.
My mom first got the iPhone 4, before that she had a nokia flip phone, she could use it from day 1. Nowadays I buy the newest iPhone, and after 1-2 years or so I sell it to one of my parents for a 'nice' price. The iPad I made them buy (and they upgraded it once) is very popular.
But the most used Apple product is the AppleTV. It has enabled them so watch the news when they want, and Youtube has given them access to content (travel) they'd never had before.
Sharing photo albums, facetime video calls, imessage and ease of use is just on a level I don't think exists with android - of course, sometimes theres the small hiccup.
But they are not 93 years old so the mileage might vary :)
To her, it's almost like a television, as family members are able to call her and even initiate calls. (Although we often have to call her on the normal phone to get her to realize that we're calling her on her computer, or to plug it in --- this is the one thing she does do with the hardware.)
The key point is the single function: a general purpose computing device has more UI & management than some people want to deal with. This is something the industry really hasn’t done a great job with, especially since it overlaps with the problem of treating things as disposable because the revenue model for single purpose devices is mostly broken and so people are often forced to churn them because the device they’re used to has been discontinued or no longer works with their WiFi.
My grandmother as mentioned uses an iPad which is the only user friendly tablet or "computer" I would ever give her.
She uses it for general browsing and e-mail as well, as well as taking photos and browsing albums in iCloud. No messaging though.