What a diff'rence 2 years make.
1964 brunettes Pamela Tiffin and Nancy Sinatra co-star in the teen beach flick, For Those Who Think Young.
Flash forward 1966: They both run for the dye bottle....
FYI: The title of this blog post comes from Miss Clairol's famous advertising slogan. But I trust you pop culture fanatics knew that. :)