Type Checklist:

An analysis of the previous examples shows that the following visual properties could be considered beneficial for typefaces that might be viewed by older viewers:

• Consistent stroke widths
• Open counterforms
• Pronounced ascenders and descenders
• Wider horizontal proportions
• More distinct forms for each character (such as tails on the lowercase letters “t” and “j”)
• Extended horizontal strokes for certain letterforms (such as the arm of the lowercase letter “r” or the crossbar of the lowercase letter “t”)

(Source: aiga.org)