You can make the font bolder / bigger in Settings > General > Accessibility. There are a couple settings for the font in there.
I have trouble inside ....but I like it overall. I think a slightly bolder font is going to be necessary especially depending on the background/wallpaper one uses, at least as an option.
I'm 40 and my eyes are not as good as they were 10 years ago.
Anyone else having problems with the visibility on apps like messaging and other thin non contrasty text?
I run with my brightness higher on ios7 than I did on 6.