It is such a great idea to mentor others who did or do not have things as you do.  What I mean by that is that many people may not have the upbringing you did and they ended up where they didn’t want to due to circumstances.  There is a correlation between self improvement and helping others and it doesn’t come directly from self satisfaction.  It comes from looking at others which in turn helps you look at yourself from a different angle.  Also, you CAN mentor others your age or older because mentoring is help that other people may need from you that you may have the ability to do but because of your age its harder to develop.  Be friendly, proactive, and honest about what you are looking to do and many people will take your mentoring.  It can even be friendly so it comes down to how you perceive the situation to be.