In John Mueller’s 09/17/2021 hangout, a webmaster was worried about new pages they added to their site—generally, much younger pages. They were also worried about how they impacted site quality.
He was curious about what the overall effect was regarding the quality of the newer pages vs. older pages.
John advised it’s a process that takes a lot of time. There’s a long lead time when you add pages to sites that already have thousands of pages. Google has to understand those in the context of all of the very old pages vs. the brand-new ones that were just added.
This discussion occurs at the 15:20 point in the video: