A lot of older men, some with hair, some without have HORRIFIC bushy eyebrows so that rules that theory out.

He has nice (REAL) hair, the type we without hair are patterning a replacment after....

I know of a lot of guys with real full hairlines, (yes it pisses me off) but thats the luck of the draw. I worked with a man in his 70's, had the most magnificent hair, naturally grey, naturally full.