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if you're a senior and shes a freshman, you have enough social standing in her eyes to do anything. you don't need to impress her...in high school its basically a grade older is automatically upgraded social status. Like the other guys said, say something funny at first and bust her on whatever she says.
I agree, you already have an advantage of being older than she is. However, I think this could also become an obstacle unless she's a little mature for her age. Bottom line, I don't think you should have to try very hard to get her interested if you're older.