This is more to prompt thinking than to define the answer itself. You’re gonna have to update stuff, or your content will get stale in a month.
Search engines love love love fresh content. Even writing a blog post once a week will improve your website’s findability.
Just as important is having a process in place to make changes when your business changes. We were embarrassed to realize our California contact information was still on our website when we’d had a New Jersey address for over a month. Don’t let this happen to you. Have a schedule for updates, whether it’s new content or a review of the existing.