That experiment is so interesting! One of the things I've noticed now that I'm using only natural organic olive, almond & coconut oils on my skin is how soft the surface has gotten. Like baby skin, though without the thickness, resiliancy and fat pads underneath. Still soft and glowing!
I thought the rough/hard adult skin was just part of maturity. Perhaps it was due to all the mineral oil based lotions I used. When I was a teenager, I used vaseline on my skin after baths!
The smile "crinkles" around my eyes softened and the permanent indentations have disapeared. Scars on my knees, shaving scars, even an old burn scar on my wrist have faded considerably. I though they were permanent, but the good oils have "activated" my skin renewal process. Not bad for someone approaching 50!
That said, I'd love to increase the collagen in my skin. The skin around my eyes is smooth, but "sunken".