"We've been working hard. We're starting to grow up," Horan said. "We're still young, but we've passed the initial teenage years. ...We've grown up quite quick in the job we have to do and we became a lot more independent."
The group — which includes Zayn Malik, Liam Payne and Louis Tomlinson — will launch a worldwide tour in February. They hope to work with Katy Perry and are still trying to adjust to the celebrity and fame that has taken over their lives.
"I can see how it gets to people. I guess it's quite easy to get wrapped up in it all," Styles said. "We do the same things every other lad our age does. We go out, we have fun, we meet girls and stuff like that. Sometimes it gets written about, which, yeah, we think about it and it's absolutely crazy. It's still a bit weird thinking that that's the way it is."
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