 [ Symptoms ] why do i have gray pubic hair at the age of 43 [ Disease ] i do not know the greying and whiting of hair is usually genetically determined so blame it on your parents or grand parents my head hair turned grey in my 30 is and by my mid 40 is i was as white as snow if you do not like grey pubic hair shave it off or dye it a different color or just ignore it as part of our progressive aging cycle