For the record, I'm 28, she's 21, we fucked 3 times. Today I told her "children are not allowed alcohool, go drink some milk" she responds in a playful manner "ha, you just say that because you're old and you're envious".

I went with the 'agree and amplify' approach "Yeah, I'm so old and envious that I cry myself to sleep every night".

This shit-test will come again, so I need some other responses. Throw 'em at me.