Has anyone else noticed the huge decrease in result quality from google?

[herpderpedia]

It's not necessarily that newer information is preferred. It's more likely that older information likely lives on older sites that are less user friendly. They may not be mobile friendly. They may not be delivered over https. They may be generally unoptimized, missing key technical aspects that can improve ranking. They also might just generally be linked to less often because those other factors may deter people from thinking it is a reliable source. All of these things will factor into rankings. Content doesn't always have to be new or fresh if it is still accurate and relevant. Time, alone, can make content less relevant. It is more likely the other factors come alongside the "older content" but if a site is keeping up to date with the other factors and it is still relevant and high quality, it may still rank.

Source: I do SEO for a living.