OK.
The FontSize is 18pt.
The FontFace is Myriad Set Pro Light
The FontColor is #333333 - a Dark Gray, the same color as the very bottom of the ramp of the REPLY button
Several of us folks employ Cascading Style Sheets to modify our experience. MOST think everything is too BIG.
If you are interested, our pal turingtest2 has a User Tip - Minimal CSS tweaks for ASC - that does a few things tha you might find helpful, especially if you are comfortable tweaking thing to your own taste like I do
these are excerpts from Minimal CSS tweaks for ASC
- First you need a way to get your CSS to override that of the site. To do this I use the add on Stylish for Chrome. See also Stylish for Firefox, Stylish for Safari, Stylish for Opera, and the website https://userstyles.org/ for more information. Sadly I'm not currently aware of any way to implement this on mobile devices such as iPads and iPhones.
- Then, go here and choose the {Install with Stylish} button
Apple Support Communities - Minimal - Themes and Skins for Apple - userstyles.orghttps://userstyles.org/styles/129130/apple-support-communities-minimal
You then can edit the style - choose the Stylish icon in your browser toolbar

then "Manage styles..." - then [Edit] the Minimal style
Change "font-size" values to taste (upward likely, I prefer smaller) - Apple stock AND Minimal are both 18px (Apple adopted 18px after tt2 suggested it)
Change "font-weight" values FROM 'normal' to a numeric value GREATER than 400 in 100 increments up to 900 which is BOLD
"font-color" is supposed to be BLACK = #000000, but it is Apple stock #333333 so for some reason (I am firing off a missive to turingtest2 right after I finish this for advice on HIS parameters)