Grandparents under 65 are more likely to display a style.

Grandparents under 65 are more likely to display a fun-seeking style
They are relatively young grandparents, which means that they will be more modern, and understand their grandchildren more. This is why they will apply a fun-seeking style, as opposed to those grandparents above 65, who will be more formal.

S^2 = a4^2 = a4 * 4 = a16 centimeters = area of the square