How do you get new Gmail address and cancel exsisting Gmail address?

you can't you just don't go on it and forget about it

u dont because gmail sucks and will mess up other accounts eg youtube stay way from it

You can use filter in Gmail: [http://support.google.com/mail/bin/answer.py?hl=en&answer=6579]

You can't, You can only sign up for a new account.

Most emails want the user to be at least 13 years old before they can have an email account. However, some emails don't care how old you are. Gmail, wants you to be at least 13 years of age.