How do I decline or accept a commitment from a girl who is younger than me and wants to go out with me?

I miss him young girl while ago. We met on Facebook at first, and then we met in person with her mom.

Every time she sees me she winks at me, or she'll steal a kiss and run. She is very pretty and outgoing.

There is only one problem, she's 19 going on 20, and I'm 34 years old.

I asked her why couldn't she pick a guy her own age, she says because they're immature and stupid.

There are times where I can't even sit down and talk to her, without a hundred eyes looking at me.

By law she is of age, but everyone tries to make her and seem like she's younger than that.

I just want to be her friend, but she doesn't want to be my friend anymore, she wants to be my girlfriend, and she said that I have four days to make a decision.

What should I do in a situation like this, tell her to move on, or go with the flow?