How do you get rid of a Twitter account?

[angel]

So you know how on Facebook, if you make a new account, you can deactivate the other even if you don't know your email or password for the old one? You just say this is my old account? Well how do you do that on Twitter? I have a new account now, but I found one that I made when I was in the seventh grade - six years ago. How do I get rid of it? I don't know any of the information I used...