meaning of eight and one sentence, thanks

[XINLAI-UE]

Hi, I got two questions, thanks for your help.

1. What does "eight" mean here?

(Context: Script's form Friends, Ross's pretty sad, 'cause he got divorced, so his friend Joey speaks to him with the words below)
Joey: What are you talking about? "One woman"? That's like saying there's only one flavor of ice cream for you. Let me tell you something, Ross. There's lots of flavors out there. There's Rocky Road, and Cookie Dough, and Bing! Cherry Vanilla. You could get 'em with Jimmies, or nuts, or whipped cream! This is the best thing that ever happened to you! You got married, you were, like, what, eight? Welcome back to the world! Grab a spoon!


2. More than I've ever wanted to hurt anyone in my life.
What does this sentence mean? I can't understand it.

Barry: Not for her. Listen, I really wanted to thank you.
Rachel: Okay..
Barry: See, about a month ago, I wanted to hurt you. More than I've ever wanted to hurt anyone in my life. And I'm an orthodontist.
Rachel: Wow.
Barry: You know, you were right? I mean, I thought we were happy. We weren't happy. But with Mindy, now I'm happy.

Okay, that's all, thanks for your help and have a nice day!:-D

 

[jamiep]

Joey: You gor married when you were, what, like eight (years old).

He's making the point that Ross was young when he got married.

More than I've ever wanted to hurt anyone in my life

It means that he wanted revenge, he was angry with her and wanted to make her suffer. His job is an orthodontist - a kind of dentist - so he's used to making sure people don't feel pain, or hurt