Harry Potter and the Goblet of Fire Coming of Age Quotes

Dumbledore tells Harry this when he finds the boy looking into his "Pensieve," which is where he stashes his memories to avoid overloading his brain. This quote doesn't really have anything to do with coming of age per se, but he's dropping some solid adult advice here: as Harry's life gets more dangerous, he really should try not to take on too much too fast, even just in terms of knowledge.

Stating the obvious here: the Triwizard Cup is not for kids. At this moment, Cedric and Harry are trying to find their way out of a maze that basically just tried to eat Cedric. Some game indeed.

They're probably mostly talking about the fact that Voldemort is back, but it goes for their personal lives, too: these kids aren't kids anymore, and their relationships are about to change a lot, too.