There's not a law on this. You can be of any age.
Its not 10 its 13.
you have to be at least 13 years old to make an account like in any other website.
You create your own website and submit your own reviews on it!!! I recomend www.own-free-website.com. You create your own website and submit them on to there.
Weebly.com
Sure. Just go to "webs.com" and create a website using their services. it's free, but you won't fully have your own domain (website) name. that's ok though. :)
You can create your own website from GoDaddy or any other domain site. From there, you can create your own email address for your own website for professional use.
MYjordancreation.com
Well almost anyone can make a website if they know what they are doing. However a seven year old will most likely lack the knowledge and proper skills to create and manage their own website.
You can create your own horse on http://www.howrse.com/ have fun! : ) Another site is horseland.com
Wizard101?
no
Make A website