Most Helpful Girl
Did she really just turn 18? Call it a hunch but I think you're lying.
Most Helpful Guy
Why lie? Most girls prefer older guys, you'd have better chances using your real age.
Anyway if you want something serious with her tell her now, she'll find eventually and the likelihood of her not leaving you is greater the longer you wait to tell her. If you don't want anything serious you could probably conceal your age from her.
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