You must be 18 years of age or older to have your own account and WWOOF solo. Anyone under the age of 18 must travel with a parent or legal guardian who is 18 years of age or older.
WWOOF Italia, WWOOF Portugal, WWOOF Germany, WWOOF Korea and WWOOF UK are the only organisations that accept WWOOFers from 16, please get in touch with them directly to find out more.