Why Debian? (Score 3, Interesting)

As someone that is new to Linux I've always found Debian to be somewhat weird. I guess a lot of Debian users uses it since they are used to it. But as a new Linux user, why would I use Debian when the software is so old and outdated? We're at Firefox 20 and Debian has only version 10. OK that Firefox revs every six weeks, but you get the point. If it's old from day one then how old won't it be when Debian 8 is released.