My grandmother (100) just phoned me using FaceTime on her iPad. I find this insanely cool. She was born during World War 1, experienced World War 2 and is now able to enjoy modern technology to get in touch with her family. The only issue she has is accidentally touching the screen.
My dad never was comfortable with PCs and I’m quite sure that Mac, Linux, whatever wouldn’t have made the slightest bit of difference. He just never got comfortable with the whole mental model. Gave him an iPad. Problem solved.
My family recently got my mother's parents (100 and 98 who live independently) a grandpad. It's a closed network social media, meaning people have to be invited to it. It is designed for old people. They figured out how to navigate it themselves in ten minutes. It can call, video call, and leave mass voicemails.
From the children/grandchildren perspective, nothing has changed as it has Facebook and instagram integration, so we dont have to post on it directly.