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<p>Yes, though as someone else mentioned, an employer won’t ask your age in an interview. If I could tell that someone was very young, the key concerns have to do with maturity and the person’s ability to manage / relate to others. These can easily be overcome by a student who has work experience or extracurricular experience where he or she is in a leadership position and handles the situation well. </p>
<p>As an interviewer, you can also resolve concerns about maturity in the interview. You can listen to the person’s language (does he or she use childish phrasing or “like” all the time?) look at how he or she dresses, and get an idea of the types of mannerisms being used.</p>
<p>If you’re extremely worried, the easiest thing is to “dress” older. Go with a dark suit, have it fitted (nothing says “young” more than a suit that doesn’t fit), wear french cuffs, and have a conservative tie.</p>
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<p>They sometimes do, and this is harder to overcome. If you have excellent credentials, they won’t care. If you’re borderline for that school, have one of your references comment about your maturity level. That’s really all you can do.</p>