SpiderCOS is correct from my experience. And as for IBLs and all that jazz, tying here to a recent post on sandboxes and how they can help keep spammers down, that's fine and all, but the SEs don't seem too keen on encouraging creaky old sites to add new pages, which seems at odds with giving old domains brownie points for being... old?
Case in point: domain X has been active and growing and adding and refreshing content for a decade, 30 staffers that deliver content only via the web, mostly free interns and NFP in all but name. Thousands of pages that if you update them, get reindexed in a few days and there you go. But don't add a new page, because then you get to enjoy the sandbox with
PR 0 and not-in-top-1000 for esoteric keywords for 120 days. What a load of rubbish.
If the search engines want to have their IBLs and PRs and penalty boxes all at the same time, they ought to have some sort of faster-inclusion flag for new pages added to older, established domains that are already well-regarded and ranked, and have 10k relevant one-way IBLs on the books. Just my opinion, I would prefer not to see age be such a strong influence on rankings in the first place. What about, like, making content count for something, and swiftly? Isn't that what we read in white-hat
SEO articles all the time? Content is king all right, but only if you want to read all about it a year from now. No wonder the masses love their throwaway blogs these days.