Typically, Google Discover shows content that is less than a day old, but it can show content that is weeks, months, or even years old. However, typically, Google will show more recent content in the Discover feed. Well, that may have changed with the new Google follow feature.
Glenn Gabe, who is a very active Google Discover user, noticed that since the Follow feature rolled out, he has been seeing content that is weeks and months old way more often than before the follow feature rolled out. Glenn wrote on X that "this could also be playing a role. i.e. Google isn't providing as much recent content, but instead, focusing on providing targeted content based on the topics you are following."
It makes sense that if you follow a specific topic and if Google Discover only shows the most authoritative types of content, it might be hard for Google to find new content on that topic. So it does make sense that Google may show older content more often for that specific topic you follow.
Here are screenshots Glenn shared:
Have you noticed this in your Discover feed?
Forum discussion at X.