Well, it depends on how you count. For example, Debian Squeeze is not yet released. But it's going to be way outdated at release time, if you take some specific high-profile examples:
- Python 2.6 (not 2.7, released Jul 3)
- Linux 2.6.32 (not 2.6.33-2.6.35, 2.6.33 released Feb 24)
- GCC 4.4 (not 4.5, released Apr 15)
- Firefox 3.5 (not 3.6, released Jan 21)
- Thunderbird 3.0 (not 3.1, released Jun 24)
So, by your measures, Squeeze is not yet 0 years old, but if you measure by firefox version included, it's already 8 months out of date and it hasn't even been released yet.
I don't have a major problem with that; I use Debian on all my machines -- stable (lenny) on most of them. And basically the only software I've upgraded on those is emacs23 and linux 2.6.32.
But it does seem somewhat of a shame that it takes so long to stabilize things and get a release ready after starting to freeze packages, that much of the software is 6+ months out of date at the day of release. Maybe CUT will help with that.