This is a rule passed down to us, and to you, from our mothers (your grandmothers). We like it, too, particularly because they still look good from following it.
Also, SUNSCREEN. Always wear at least SPF 30 or higher. You’ll most likely be pale. Don’t feel sad, look at it this way, in the olden days being pale was a sign of being rich! See Kids! Class Entitlement!
But seriously though, skin cancer sucks. It’s killed a lot of people, it cost the Eagles the shot at a Super Bowl because it killed our defensive coordinator. So, put some sunscreen on.