Seen here looking suspiciously like Gandalf (cast a healing spell on that shit, bro!), a 69-year old trucker who's had the left side of his face exposed to the sun for 28 years (from the driver's side window) shows off the notable difference in skin texture from the right, normally shaded side. That...wow. I would have maybe looked into driving a British truck every-other haul.
His condition is called unilateral dermatoheliosis, from the Greek dermis and helios, skin and sun. It's also called photoaging, and it results from chronic exposure to the sun's UVA and UVB rays. In his case, it only affected the left side of his face because of his work. As he drove, he received much many hours of sunlight through the left window of his vehicle.
Now I know what you're thinking, "Big deal -- I spend all day indoors staring at a computer or television screen, there's no way that's ever gonna happen to me." And you know what? You're right. Sad, but right. I dunno, go hit the beach or something, shit! "Sharks." Right again! Scoot over and make some room for me on the couch.
Thanks to bb, who is beautifully fair-skinned and has to be very careful in the sun. Me? I'm reckless in the sun! *runs across street blindfolded*