I once read that if you register your domain for a year rather than 3 years, you ranking will be lower? Is this true?
I have no doubt that it is one of the hundreds of factors used in determining the ranking of your site. However unless your site is borderline spam it won't have any effect. For the price of a longer registration its best to register for more than one year IMO.
Buying a domain for several years will not help, having the domain for several years helps. The age of a domain gives the appearance of longevity and therefore may give the site a higher relevancy score in SEs.
The google patent gave an example on a domain being registered for 10 years vs 1 year might be given more weight. The theory being that "throw-away" domains used for black hat SEO are only likely to be registered for a year. Google doesn't disclose its algorithm, and there is no way to tell what they are currently using. I think if is carries any weight, it is extremely small.
The length of time you purchase the domain for initially has nothing to do with its rankability or ranking factors. There are other things concerning domain names that come into play as far as ranking is concerned. Age of active domain happens to be one of them.
Length of how long the domain is registered for isn't something that's taken into consideration. However, the length of time that has lapsed (ie. the "age" of the domain) is something that might play a role.
i think age as well as the time you have booked the domain for counts.Because if your domain expires tommorrow than whats the point in indexing it today.Right.
.com.au domains don't list expiry dates http://whois.ausregistry.com.au/index.php?domain=google.com.au and .uk and .au domains have a set registration/renewal period of 2 years http://xwhois.com/default.asp?domain=google.co.uk I don't think google would put these namespaces at a disavantage because they only be registered for up to 2 and a bit years in the future.