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I'm not sure if this will help you, but I'm 60 and can no longer read small print such as ingredients on a bottle of sauce etc without much squinting. I find reading paperbacks a strain. One reason is that it's ages since I've been to the opticians and I need different strength reading glasses for each eye!
Back to the point: despite this, I prefer easy-to-handle 6" ereaders, rather than anything larger. I install my own fonts, my favourite being Merriweather which I read at setting 7. It just means 'turning the page' more often; which gives a sense of achievement.
However, I don't read PDFs, except on my laptop, just kindle formats, preferably AZW3. AND I don't need a huge font.
If your father does need a very large font size, such that he would only see maybe three or four words per line on a 6" reader, a larger reader would be better. Maybe try something like the Forma, or the Oasis. Both are larger ereaders in the 8" realm.
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