Hi Chris
Yes small print and images for those focus challenged is a real pain these days. A bigger monitor allows bigger resolution lets say 1080i or P for horizontal resolution...much easier on the eyes.
As H said since the avatars are 80 x 80 pixels...enlarging them will make them look grainy
But a cheap trick is to use "ctrl and scroll wheel" on your mouse or "ctrl + or - key" to enlarge or shrink the page you are seeing.
Lastly my favourite for visually challenged...folk....use
virtual magnifying glass...like holding a magnifying glass over the area your want.
Here is the difference:
H's head normal size and H's Head with the magnifier...ain't he a hottie (remember to click image to open them in another window for comparative sizes as this windows looks like it resizes them to almost the same! but in a new window...hell he has a big head!!