I have a 1440p dual monitor setup and the font for the menus were too small for me to see without squinting. I found a solution through a google search. Hope this helps others
Something else you can do is go into User Preference > System> General…and change the DPI to your desired setting. This will change the size of fonts for the entirety of Blender.
I didn’t check to see if the solution above was theme specific. I tend to bounce around between themes and see no different in font size when changing between them. For me, changing the DPI is a better options but, I am running a single 27 inch monitor. Changing the text font in the themes as mentioned may be the better solution for dual monitors.
Yeah I found that later explained in one of the other videos. Just got ahead of myself because the font was soo small on my screen, I googled it. Thank you for the response 
You are most welcome! I have old eyes and took me forever to find a solution googling around a few years ago. Thank you for sharing! Teamwork is a wonderful thing…now we have multiple solutions.