Great article! I really appreciate your experiments. I am interested in how an older demographic would view line length, font size, and line spacing. A lot my projects need to be designed with a wide range of ages in mind. Do you know of any similar research done for older age groups, genX or baby boomers?

I’m also curious about the serif/sans serif dilemma. I love a good serif in web copy (medium’s formatting, for example), but it’s a highly contested point of view at my company. I’ll keep trying to get it approved on a project ;)