It gives 50pts weight. Just kidding, but I think it gives weight if you've been able to hold your rank since the 90s, not so much if the domain was purchased in the 90s. I.e. you can't just buy a domain 1990 and start marketing it 2009 and expect to get to much benefit, the fact that you domain held it's rank for a long time, that is what makes it as beneficial as it is. Same as finance, if there is more stability over a long period of time with steady growth, you can expect more growth, I would think that works the same with SEO as well, I have plenty of old domains I stopped marketing but once made BANK, they will tank so keep on it (i.e. marketing ect.,)
lol, i dont think i you meant to say this did you? if they start out ten yers older than you I would have thought they'd always be ten years older than you? very much disagree although there seems to be a little boost at one year and possibly another one at about 18months from what we've observed on our test site i would refer you back to this search. seo design packages the number one site there is 6 months old and has been number #1 since one week from launch, then we have seoibiza (1.5 years) then seo design solutions (2.5 years and US top 10 for "SEO") it doesnt seem to matter at all anymore (and weighting-wise, we dont know how much it ever did really) until over 5 years domain age IMO