Creepy is BEHAVIOR, not appearances.
Creepy is continuing to violate someone’s personal boundaries after being told to stop.
It’s also violating a boundary that any rational human being can assume is in place, like walking up behind someone you’ve never / have just met at a party and groping them.
In short, creepy is a complete disregard for the concept of consent.
This needs to be required reading for any guy who thinks that looks plays any part of this. Especially the parts about understanding when you are being told NO. It’s not cute to persist after you’ve been declined, no matter how hot you are, and I don’t know any person who thinks it is. Socially Awkward Isn't An Excuse
Data point: I’ve been creeped on by an extraordinarily hot man. It wasn’t cute. It did NOT encourage me to date him. In fact, it absolutely ensured I ran the other way, and breathed a sigh of relief at having dodged a bullet.
The age difference thing that a couple people have brought up is a red herring. If a man of ANY age, who is a total stranger to me, walks up to me and the first thing out of their mouth is “We should go out on a date,” I will think he is creepy. Because his behavior is inappropriate. If I don’t even know your name, I’m not going to consent to date you, and as I mentioned above, rational human beings are aware of that very basic boundary of human interaction.
On the other hand, if a 70-year-old man was behind me in line at the coffee shop, made a comment about the book I was holding, and responded appropriately to my ensuing response and body language, that is NOT creepy. If I shrug and turn my back on him, and he backs off: not creepy. If I choose to engage him in a conversation, and we talk about the book: not creepy. If he starts talking about the book, and then tries to force the conversation towards sex: creepy. If we talk about the book for 20 minutes, and he then asks if I’d like to continue the conversation tomorrow over coffee: kind of sad, but not creepy. If he responds to my subsequent “No, thanks” with dramatic, mortal offense and calls me names: creepy as ever-fuck.
BE HAV I OR. Not age. Not looks.