Actually, despite the eyesight and other issues, from what I have seen, older people, especially older women love tablets. Even some that type enough I wondered how they could prefer them. Not sure I get it, but I have seen that to be the case in several instances, and most of them had/have a desktop or laptop. So they aren't people new to computers.
The secret is in the short distance from the keyboard to the letters on the screen. This demographic needs to see the key to press, and to see the key appear on the screen.