We make them so small to ensure only up-and-coming young programmers (and young experts) can read them.
in reply to Why Are The Code Snippets So Tiny
But if that's not satisfactory (and if you can prove you are amongst the "young" -- say between 14 and 104), then you may find help in the fact that the display settings are --- woot, hold onto your hat -- Adjustable!
Go to Display Settings, scroll down to the "Code Listings" section, and check the box for "Large Code Font". Alternately search out some of the threads about user-written css styling.