Because SEO involves keeping your website organic and is constantly evolving, your meta data should reflect that evolution. Therefore, when data on your website changes, your meta data should reflect that. Although you do not have to refresh meta data with every website update, it is vital that it be done at least once every couple of months.
Refreshing meta data also makes your webpage appear new. You could be getting a first page rank on Google with little click-through due to your meta data, especially your meta description. By refreshing and updating your meta data, users may take notice of your website, and click through. Old visitors who have not checked out your page in some time, may be tempted by a promise of added information in your meta data.
New meta data also signals to search engine robots that there are new pages or more pages to index on a website – this can make considerable tribute to your ranking as search engines take a favourable interest in your webpage.
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