There are many reasons for ensure your website content is constantly updated and current.  Three important reasons are the following:

1) To take advantage of Search-Engine-Optimization (SEO), which allows your site to be indexed and found by various search engines.

2) In the digital age, customers look for value and connection; they want to understand the value your brand/product adds to their choices and the impact it has on the world.

3) Our lives are fas paced and technology changes on a daily basis.  It is important to exemplify that your company/product aligns with the modern mode.