I know an 88 year old that likes being able to read PW under the blankets.
If you have a laptop/PC (Best way to shop on Amazon), then there is easy to use
www.gutenberg.org with 58,000+ out of copyright books (The 88 yo can manage that but often can't manage email). Also
www.smashwords.com (treats authors better than Amazon) for buying and free titles. All legitimate.
I've loaned my (deregistered) Kindle DXG to someone in 70s with Macular Degeneration to see how they manage. He's not fussed on the Text to Speech (yet, and hopes he won't need that).