What's your perception?

I don't know too many men at the age or my own age who would not want sex with a hot 19 year old. But that is just with sex. For something more permanent, you would be a slight distraction. A person in their 30's or older would be frowned upon in public in america, being tagged as a pervert and sugar daddy. You would have mixed reactions though. Some would hail you for your maturity, others would ridicule you as a gold digger. Its a very touchy subject. Your personality and how you relate to him will determine how he treats you. No matter how pretty a younger woman may be, older men are more experience and is difficult to enchant them with your looks. If he decides you are an eyesore, he will dump you faster than moly potatoes with worms whereas younger men would probably be hooked. If you are indeed looking for a sex-fling, my best suggestion is to keep this under wraps and discreet.

Have fun and good luck with this.

How he is going to look at you depends on the conversation. It does seem like immature would be hard to conceal, but at 19 it's hard to say. Some girls at 19 are very grown up. But if you're more interested in the physical part than any emotional involvement, then does it matter that much? What if he's not just wanting something physical? You know what you're getting into, but does he? Are you thinking about what happens if he falls hard and you're still in casual mode?

He is probably flattered that a hot young thing is even talking to him lol