Due to medications, it makes my skin very thin so the hospital strongly advised that I put sunscreen and cover up when I go outside (long sleeved shirt or sleeves, hat). My wife calls me a vampire. Most people like sunny days. If it is cloud and dark outside I am estatic.
So I put sunscreen on during the spring/summer months. During winter it is cold out and I cover up with a parka to block out the sun,
However, using sunscreen is just half the battle. Stay out of the sun or find shade as the sun can drastically age your skin fast.