If you’re planning to use WordPress or already using WordPress as your website, please make sure to update it every 3 years at the maximum.
WordPress always support backward compatibilities, but there is a limit to where it will support.
If your website has been there for 3 years without any update, your website is not that important. Either use a simple HTML website or just forget about having a website.
Funny how website suddenly becomes some important aspect of one business after social media websites.