Contrary to popular belief, there is no golden rule as to how often your website content should be updated. The answer is actually a lot simpler: as often as it needs to be.
If you’ve used statistics on your website, it’s worth updating those yearly to ensure you’re providing users with the most up-to-date information and are linking to recent sources. This is true for blog content too. Otherwise, content only needs updating if something changes (i.e. your company offering changes or evolves, a new employee starts and needs to be added to your About Us page, a product changes its formula, etc).
You’ll likely make minor changes quite regularly, but a full overhaul isn’t necessary if it was built correctly from the start.
