i've been browsing a lot of bearblogs and neocities pages and whatnot recently and i see this everywhere!!!!!
please use at least 16px for your main text. this is the default size in every browser for a reason (well, backwards compatibility, mainly, but still)
it's actually good to make some of the text on your site bigger than that. i would recommend 20px for main content.
EDIT: (sorry for the exasperated tone...)
i would suggest line-height: 1.5 for most body content. you can make it smaller on labels and headings if you like, but seriously. 20px text with 1.5 line height is a million times easier to read
it will look REALLY BIG when you change it but you'll adjust!
seriously we have been using font sizes much larger than our peers for our entire life
that's because we have vision issues; we didn't realize that as kids but it's clear in hindsight (ha)
