A man, very old, squinted at me with a contemptuous mouth. What does he mean?

A person is very old. His eyes are a bit sinister, squinting is a bit cunning, and his mouth is bruised. Since you don't know him, don't touch him too much. Her mouth is contemptuous, maybe it's a habit, or maybe he really despises you, so if you can't see through it, you should keep your distance from him.