In AmE, as a person ages his hair first starts turning grey, then eventually (once the top of his head is the color of snow) we will describe him as having "white" hair.
In AmE, there are almost too many descriptions of hair color (thanks to the shampoo and hair dye industries). For example, a person with light or "yellow" hair used to simply be a blonde. Today, we describe them as a "honey blonde," "platinum blonde," "ash blonde," "champagne blonde," etc., depending on the actual shade of their hair. :roll:
"Ginger" as a description for red hair is strictly BrE. Depending on the hue of their hair, a redhead in AmE might be described simply as a redhead, or a carrot top, or a strawberry blonde. Of course, fashion magazines also use terms such as "titian," "copper" and "mahogany."