For pretty much any version of Office since Office 2007, ALT+H, FF gets you to the dropdown to choose font face and ALT+H, followed by FS takes you to the dropdown for font size.
You can also use CTRL+Shift+F to bring up the full Font Dialog which includes pretty much any choice related to font you can think of. Once it's open ALT+S takes you straight to the size attribute.
Brian - Windows 10 Pro, 64-Bit, Version 1903, Build 18362
Many of the insights of the saint stem from his experience as a sinner.
~ Eric Hoffer