Should the text size on the Macbook scare me?

You know your not stuck with small font's. All you have to do is ctrl + or - to increase or decrease the font size. You should see how large my fonts are for my sorry eyes. Also in Safari and Mail I added a button to the tool bar that has a small "a and a large A" which does the same thing.

Not sure if your aware of this. Just trying to help out! Best of luck to ya!

 

Yeah, definitely an option on any MB, but not sure about your sister's PC. Previous poster ^^^ easily explains the situation. Enjoy your LARGE font size.

 

Also remember that Mac OS X renders fonts differently compared to Windows. Fonts tend to appear with a heavier weight on Macs, which helps with clarity.