What size screen are you using?
For instance If I set Word or Excel to 100% (which btw means you see 100% of the entire page in the middle of the screen), the size of the Font will look minuscule.
I use a 17" (yes you read right- gosh am I going to hate to go to 15" screen my next Mac I have enough issues with eyesight) MacBook Pro 100% looks to be about 2" wide by 2.5-3 tall.
Go to zoom button on Standard Tool bar and set to "Page Width". To view at normal size 292%.
Oh what you see on screen doesn't translate exactly to what you see on screen. What is Printed will be in 12pt format is set for 12pt. While on screen it may look visually 20pt.
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Disclaimer:
The opinions & replies are solely mine, and do not reflect upon my position as a Community Moderator.