It depends on whether your post offends or impresses whoever chooses to address it first. If they're offended, you're still a n00b.
They invade our space, and we fall back. They assimilate entire worlds, and we fall back. Well no more! The line must be drawn HEEYAH! THIS far, NO further! AND I WILL MAKE THEM PAY FOR WHAT THEY'VE DONE!
It's relative. From the perspective of someone who's been here from the beginning, someone who's only been around a year or so is probably still a noob. From the perspective of someone who's been around a couple of years, someone who's been around half that long isn't a noob.