I believe that old domains which are constantly updated with either new products or new information have an advantage over new domains in terms of high ranking. Are we agreed? I think it is a good way of filtering through serious websites/companies so that every tom, dick and harry who has a good idea doesnt make a website today and its straight to the top of the list tomorrow. I think anyone serious about doing an online biz should be in it for the long run.
Now, being on the other side of the fence, we started a new website about 12 months ago and its struggling! I believe this is an age factor.
So my question is, if you believe also that the age factor is a big ranking factor, then how long does a domain have to be in operation before it gets over this hurdle?