On two occasions on the same bus route, I couldn’t stand to watch late-middle-aged persons (eyeglasses perched on forehead in one case) struggle to read their iPhones. I took hold of their phones for a moment each (I got permission) and brought up the well-hidden screen for text-size selection. They picked the bigger fonts they’d needed all along. They were so grateful it was embarrassing… More here.
An interesting angle in this article. Not something many people think about.