A threshold concept where a website needs a minimum of 3 to 6 months of age before Google begins to trust and rank it, after which additional age provides no significant advantage.
"Age is like riding the ride at Disney World, right? You must be at least this tall to ride this ride. And that's in the neighborhood of 3 to 6 months. Once you're older than that, being 20 years old or 6 months old, no real difference."