Yes. ILP Volunteers must be at least 18 before they leave for their ILP semester; you’re welcome to apply 1.5 years in advance (so when you are 16 or 17) if you’ll be 18 before you’d leave to go abroad. You must have a legal guardian who is able to sign the agreement in your behalf until you are a legal adult (then, when you turn 18, you will sign the agreement for yourself).