PowerPoint Change font for multiple text boxes

[wetbook71]

In PowerPoint 2013, does anyone know how to change the font for multiple text boxes on a slide at the same time (say from Arial to Times New Roman, or from 8 pt to 16 pt) ? Currently, you have to go into a single text box and right-click to get the font change dialogue box to open, so any font changes you make only go to that text box. If you select multiple text boxes, the only options available (upon right-clicking, from the ribbon, or from the formatting panel on the right side of the screen) are for formatting the shapes (e.g., fills, lines, positions, etc of the multiple text boxes). I can't figure out how to select several text boxes and change their fonts simultaneously. Thank you!