Domain age is the time elapsed since a domain name was first registered. Few SEO claims are repeated as confidently as "older domains rank better." It feels intuitive, but intuition is not evidence. Let's look at where the myth comes from, what the patent behind it really describes, and what Google has said.
Where does the myth come from?
The claim is almost always traced to Google's patent US 7,346,839 B2, "Information retrieval based on historical data." It was filed on December 31, 2003 (claiming a provisional application of September 30, 2003), granted on March 18, 2008 and assigned to Google Inc. It names ten inventors: Anurag Acharya, Matt Cutts, Jeffrey Dean, Paul Haahr, Monika Henzinger, Urs Hoelzle, Steve Lawrence, Karl Pfleger, Olcan Sercinoglu and Simon Tong. People quote one line about domain registration and conclude that age is a ranking signal.
The patent is much broader than that line. It describes scoring documents with many types of "history data": inception dates, content changes, query analysis, links, anchor text, traffic, user behavior, domain-related information, ranking history, bookmarks, anchor-text growth, linkage of independent peers and topics. Domain registration is a small part of it.
What does the patent actually say about domain registration?
Registration data appears in two places, with two different roles:
- As one way to date a document. The patent lists several techniques to estimate a document's inception date: the date the search engine first learns of or indexes it, the date it first discovers a link to it, the first time the document is referenced elsewhere (a news article, a newsgroup, a mailing list), the date it reaches a threshold number of pages, the server time stamp and, among them, "the date that a domain with which a document is registered." It adds that some of these techniques are "biased" because third parties can influence them. The claim that lists bases for the inception date (claim 5) does not even mention domain registration.
- As a legitimacy signal, through the expiry date. Domains "can be renewed up to a period of 10 years." The patent observes that "Valuable (legitimate) domains are often paid for several years in advance, while doorway (illegitimate) domains rarely are used for more than a year," and concludes that "the date when a domain expires in the future can be used as a factor in predicting the legitimacy of a domain." This is about how far ahead a domain is paid, not how old it is.
Does the patent reward older documents?
No, not systematically. The inception date works in both directions:
- Link growth rate. The patent gives the example of a document created yesterday with 10 back links, which "may be scored higher" than a document created 10 years ago with 100 back links, "because the rate of link growth for the former is relatively higher." One formula, H = L/log(F+2), divides the link score L by the logarithm of the time F elapsed since inception: the same link score weighs less as the document gets older.
- Spike detection. A "spiky rate of growth in the number of back links" may also "signal an attempt to spam," in which case the score may be lowered.
- Query dependence. "For some queries, older documents may be more favorable than newer ones." The engine may compare each document's age with the average age of the result set and adjust scores "either positively or negatively."
Age is therefore a relative, query-dependent input, not a bonus for being old.
What other domain signals does the patent describe?
Beyond the expiry date, the patent lists signals that speak to how a domain is run, not how long it has existed:
- The DNS record: whether "physically correct address information exists over a period of time," whether contact information "changes relatively often," and whether there are many changes "between different name servers and hosting companies." A list of known-bad contact information, name servers and IP addresses may be used.
- The name server: a "good" one hosts a mix of domains from different registrars with a hosting history; a "bad" one might host mainly pornography or doorway domains, domains with commercial words, bulk domains from a single registrar, "or might be brand new." Even then, "The newness of a name server might not automatically be a negative factor," only in combination with other factors.
The domain claim (claim 40) covers exactly these: the expiration date, the DNS record and the name server. Registration date is not one of them.
What happens when an old domain changes hands?
This is the part aged-domain buyers rarely quote. When a domain "expires and a different party purchases the domain," its new content may no longer match the anchor text of its old back links. The patent proposes to estimate the date the domain changed focus, and "All links and/or anchor text prior to that date may then be ignored or discounted." Likewise, a significant change in a document's topics "may indicate that the document has changed owners" and that previous indicators, "such as score, anchor text, etc., are no longer reliable." A sudden spike in topics can indicate a takeover as a "doorway" document, and the score may be reduced.
What has Google actually said?
Google's John Mueller answered "no" when asked on Twitter in April 2017 whether domain age matters, and wrote in July 2019: "No, domain age helps nothing." He added: "content doesn't get better automatically just because it's old." In a 2010 video, Matt Cutts, a named inventor on the patent, said that "The difference between a domain that's six months old versus one-year-old is really not that big at all," and pointed to content quality and the links it earns.
What tends to come with older domains is not age itself but the things that accumulate over time:
- More links and references from other sites
- A longer track record of useful content
- Brand and entity signals that strengthen with exposure
A ten-year-old parked domain has none of these, so age alone gives it nothing to compete with.
What does this patent change for your SEO?
- Don't buy an aged domain expecting a ranking boost. The patent describes discounting links and anchor text from before a change of owner or focus.
- Keep your domain stable and clean: consistent contact details, reputable hosting, no constant name server changes. These are the domain signals the patent actually describes.
- Treat registration length as minor. The patent presents the expiry date as one factor in predicting legitimacy, not as a ranking bonus.
- Invest in topical coverage, internal linking, and earning citations, the signals that actually compound. Age is a side effect of doing the work, not a shortcut around it.
A patent describes what a system could do. It is not confirmation that a signal is used, or how it is weighted.