Can I set the fonts size?

Due to some of my members are old in age.
Too small font's size is hard for them to read.
I want to set a default font size.
So I no need to change the size each time and remind other memeber the enlarge the font size.

set  the font in the skin you r using .

Forums - Skins - choose the using skin -  [detail] - Font Size {FONTSIZE}:
                                                                     Post Font Size {MSGFONTSIZE}:
                                                                     Small Font Size {SMFONTSIZE}:

It’s not necessary to do that. Most of browser support zoom view, and you can zoom it easily. I think you shouldn’t change the font size, for exp: A can see 12 (normal), B can only see 14 (older, or eye-problems), C can only see 18 => what size do you set to satisfy all? Do you guarantee if you set the size to so big, other members will still feel ok?
OK, that’s just my opinion, telling your members how to zoom to the size they like is better than change the text size yourself.

Method: Ctrl + Mouse Scroll (Up = Increase size, Down = Decrease size)
:victory:  Good luck