Since wrinkles appear on your face in different places and on a different timeline based off of your lifestyle and the kinds of facial expressions you make, do you think that the clones eventually start looking less and less alike as they age? Does a clone that smiles a lot get laugh lines while one who raises his eyebrows a lot has more forehead wrinkles? Do the clones who spent a lot of time in a sunny or dry climate with their helmets off have wrinklier skin than those who fought more of their battles in space or in moderate climates or with the helmets on more consistently? Do the ones who drink a lot at the clone bars get more wrinkles due to constant dehydration?
Can they eventually recognize each other by the wrinkles, does anyone see Echo out of context and immediately know it's him because he has laugh lines while Fox has one deep line right between his eyes from all the frowning he's doing?