'How to change the font in visreg

I am trying to visualize an interaction effect between age and language use with Visreg. I would like to change the text font along side the x-axis, y-axis and by-axis into Times New Roman instead of Serif. Does anyone know how to do this? This is my current code: visreg(m5, "Language_use", by= "Age", overlay = F)



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