这是Ann Smarty 所写的一篇谈论域名年龄（domain age）、站龄（website age）因素对SEO影响的分析。非常的不错，特转载供大家研究与分析，文章的核心结论是：站龄（包括反向链接时间）是重要的因素、域名年龄的作用微不足道、老域名发挥作用在于历史记录（比如，过去的反链等）。

原文：Domain Age: How Important Is It for SEO?

One SEO related question which is often asked throughout webmaster forums is how much domain registration age is important for SEO. The points behind this question include:

• well-established sites have old domain names, so by reverse logics, an old domain should mean that the site is well established;
• spammers register and drop domains quickly, thus logically spamming sites usually have newly registered domain names.

Generally, webmasters agree that domain age is hardly a powerful ranking factor but opinions vary:

1. it can be no factor at all;
2. it can play only a single minor factor in the millions of other factors (but it still is);
3. it matters a lot (as most participants of this discussion seem to agree, for example).

Google’s patent “Information Retrieval Based on Historical Data” of 03/31/2005 reviewed by WebmasterWorld forum hugely accounted for these rumors implying that Google does look into domain registration (1) and renewal (2) dates:

(1) … the date that a domain with which a document is registered may be used as an indication of the inception date of the document.

(2) Certain signals may be used to distinguish between illegitimate and legitimate domains. … Valuable (legitimate) domains are often paid for several years in advance, while doorway (illegitimate) domains rarely are used for more than a year. Therefore, the date when a domain expires in the future can be used as a factor in predicting the legitimacy of a domain and, thus, the documents associated therewith.

While the patent does sound rather straightforward (by the way its official version is no longer available online, so it might have been deleted), domain age factor is both overestimated and misinterpreted. My point is simple: domain registration date cannot speak for either quality or trustworthiness of a website as:

• domains can be registered but never used for a long time (parked);
• new domains can be used for highly established companies (with the old domain 301-redirecting to the new one);
• a domain name can be used for illegitimate purposes for years and then sold to a “good” person/ company without any change of the initial registration date.

Thus my verdict to the whole dispute is as follows:

1. Website age (and its backlink profile age) is what really matters;
2. Domain age can play a minor part only as damping factor - i.e. one of the factors signaling the search engine that this might be a spammy / illegitimate site;
3. Old domains may carry more weight due to their past records (i.e. old backlinks pointing to them) - this can be a good point to consider but then again if you are serious about your brand, keep in mind that an established domain already has associations and history before you own it and they might be hard to conquer.

Conclusion: domain registration date won’t of course hurt but it will hardly help. So I would focus on registering a new short niche-related and catchy domain name instead of trying to buy an old (previously owned by someone) one.

作者：关键词SEO研究 www.baiogo.cn