A couple years ago, I realized why. A speaker in her mid-70's shared a letter that she wished she could have sent to her 16 year old self. It was very funny. The one thing that stuck with me was, "When you are moisturizing your face, don't stop there! Continue south and moisturize your neck as well. You'll be thankful you did." She went on to explain how much she liked turtle neck season so she could hide her wrinkly neck. I thought, that's why women wear dickies!
So, moisturize your face and neck!