Create the below as .Xdefaults and place it in the /root folder. You can change font size from 18 to anything (I use 16)

# File : .Xdefaults
xterm*font: -*-fixed-medium-r-*-*-18-*-*-*-*-*-iso8859-*
xterm*font1: -*-*-*-*-*-*-2-*-*-*-*-*-*-*
xterm*font2: -misc-fixed-*-r-normal-*-8-*-*-*-*-*-iso8859-*
xterm*font3: -b&h-lucidatypewriter-bold-*-*-*-12-*-*-*-*-*-*-*
xterm*font4: -*-screen-bold-r-normal-*-16-*-*-*-*-*-iso8859-*
xterm*font5: -*-lucidatypewriter-medium-*-*-*-18-*-*-*-*-*-*-*
xterm*font6: -*-lucidatypewriter-medium-*-*-*-20-*-*-*-*-*-*-*
xterm*font7: -dec-terminal-bold-r-normal-*-14-*-*-*-*-*-iso8859-*

XTerm*background: white
XTerm*foreground: black
XTerm*pointerColor: red
XTerm*pointerColorBackground: black
XTerm*cursorColor: navy
XTerm*internalBorder: 3
XTerm*loginShell: true
XTerm*scrollBar: false
XTerm*scrollKey: true
XTerm*saveLines: 1000
XTerm*multiClickTime: