Font size of the Amazon Kindle change
The Amazon Kindle shows all the books in a preset font size. The is, however, not always legible. Therefore, you can adjust the font size at any time.
- Start your Kindle and open the desired eBook.
- Tap in the upper area of the screen.
- Now tap below the main menu line on the two letters "Aa".
- It is a small window in which you can down across the letters "Aa" in the font size you select will open.
- The Text is automatically displayed in the selected size. Finally, close the window via the Button in the upper right corner.

Kindle adjust font size (Screenshot Amazon)
Is the font still too small, you can get the Kindle books read aloud to them.