Family & Friends

Mature uni student: awkward situation. Should I cut off the friendship or keep it civil?

I'm a mature student in a foundation pathway to uni. Went to work immediately after high school and long story short I'm 29 attempting to pursue my first bachelors degree. A lot of my peers are 18-21 which is kind of strange for me but I look extremely (almost awkwardly) young for my age so people assume I'm in the same age group. There's this classmate I clicked with; we became friends because we bonded over assignments, hobbies and sports interests. Then she tells me that she's 16. She's a great person but this puts me in a very awkward spot. Would the best thing to do here be to keep it civil or cut it off?
Remain friendly
Keep a distance
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Mature uni student: awkward situation. Should I cut off the friendship or keep it civil?
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