Here are some photos I created where I combined one half of a face from one image with one half from another image.
This is me and my son at about the same age. I think we have the same eyes.
This is me and my mother at about the same age
This is me and me, adult and child
Sometimes it is hard to get the sides to line up, but kind of fun to do.
Put your two left sides with your two right sides, you will have a totally new person.