While mentorship does entail teaching and helping out your mentee, you don’t have to approach it as solely top-down. Your mentee can be a professional asset to you, the mentor, in a number of ways–from collaborating with you on a special project to connecting you to people at their company once they’ve landed their dream job (with help from their amazing mentor).
Too young or inexperienced to be a mentor, you say? There’s no such thing. A mentor doesn’t have to be a wise old person with a cane (although they can be).
All you need to be a great mentor is the desire to help someone fulfill their career potential.