You must be at least 16 years old to join WWOOF UK and to WWOOF without the presence of a parent/guardian. If you are under 16 and accompanied by your parent/s or a guardian who has taken out a membership with us that is fine, because they are the WWOOF member and you are their dependent.
We are occasionally asked if two friends, one 17 and one 15, can volunteer together. Some hosts may be prepared to take you if the 17-year-old is a WWOOF UK member and the 15-year-old has their own insurance, but the key to this is you have to be clear and honest with the host about your age, your insurance situation, your parent/guardian approval and your legal relationship (guardian etc.) from the beginning. WWOOF UK cannot say more than that, because the legal implications will be different in each case.
There is no upper age limit for members of WWOOF UK. Please check with your host that their insurance covers all ages.