It is not uncommon for someone to leading people who are older than they are. 

This situation can cause pushback; people may feel the boss selected the wrong person, you could now be supervising someone who didn't get the job, or people are skeptical about your age. 

Address the situation early and directly. Be open and available to answer questions. Help people understand performance is what matters. Always be willing to tell people the truth. Make sure you clarify your expectations. 

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