I think it is 15
You have to be 13-14 years of age or older to join hi5.com
13 and over
If you are 13 years old and up, you can become a free Basic Member of Moshi Monsters. If you are 12 years and under, you will need to have parent permission to become a free Basic Member. If you want to be a paid Moshi Member, you will need to purchase a Time Card, be old enough to have a credit or debit card, or have parent permission so they can provide their credit or debit card. If you are 12 years old and under, you will also need parent permission for membership.
You Can't sorry but you can become a member for free and do it by going to a member item and clicking on it and click on become a member!
According to Yahoo Answers,you need to be 13 to become a member of Yahoo Answers.
No, a 5-year-old cannot be a member of WikiAnswers. It is stated that you have to be at least 13 years old to be a member. It is the legal age for being a member.
18 or up
30
25 years old
facebook,hi5,boyslife.org,ridemakerz and worldvilage
You need to be 10
It depends how old but ourworld.com is fantastic