The dates attributed to articles appearing in the Google results can have a significant impact on the clickthrough rate. It’s rare that any of us would click on a 2011 article if there was a 2020 one next to it. So how do we make our older articles more competitive?
One way is to legitimately update the page with new or expanded information, and to ensure that the new date is on the page, as well as in the sitemap under the ‘lastmod’ tag. Google should pick this up (resubmit the page using Search Console as soon as you’ve done the updating, and check the results later). I also like to keep the original publication date on the page too.
Don’t forget that you can also create brand new resource pages by bringing together older ones; but always remember to redirect the old URLs to the new page.