I'm 37 and I zoom almost every website I use - I also like to be distant enough from the screen. I also very often use ctrl+A to have white text on blue background (I know, most designers will hate me at this point - but keep in mind that I usually sit in front of a screen 12 hours a day, 10 hours a day on weekends...).

Last thing, I just hate sites that use facebook comments - eg techcrunch - because fonts don't scale there. As a matter of fact, I never read comments on those websites.