Facial skin ages differently than back skin due to differences in movement, laxity, sebaceous gland density, and muscular expression.

“so your face has more movement but there's also because you need to move in certain ways there's also more areas of laxity whereas your back the skin is stretched and it's taut even though you can certainly get brown spots and wrinkles on your back think about scars on the back tend to spread they look wide and stretched and they don't heal well because it's under constant tension but I think that tension makes the back skin look different than the facial skin but you also have different oil glands in different parts of your body so you have a higher density of sebaceous glands in your face and the must look muscular expression I think it affects the way that you age more than it does in other areas”