This pic was based on this page from John Byrne's illustrious Fantastic Four run:
http://cbr3.imgix.net/wp-content/uploads/goodcomics/2015/08/reedsueages4.jpg?auto=format&cs=tinysrgb&q=50&w=852&h=1272&fit=crop

And as much as many want to blame Byrne for this, it's also been established by the Almighty Stan & Jack as well!
http://www.cbr.com/the-abandoned-an-forsaked-did-mr-fantastic-really-first-meet-the-invisible-woman-when-she-was-twelve/