| Quote #1
[…], everyone felt that the holidays were really over and everyone felt their term-time feelings beginning again, and they were all rather gloomy and no one could think of anything to say. Lucy was going to boarding school for the first time. (1.2)
Prince Caspian doesn't waste any time hitting us over the head with the whole coming of age thing. Here, the Pevensie children are going to the place where grownups are made: boarding school. The word gloomy seems pretty key.
| Quote #2
"And there were Dwarfs. And there were lovely little Fauns in all the woods. They had feet like goats. And—"
"That's all nonsense, for babies," said the King sternly. "Only fit for babies, do you hear? You're getting too old for that sort of stuff. At your age you ought to be thinking of battles and adventures, not fairy tales." (4.11-12)
Miraz doesn't want Caspian to be a Toys"R"Us—er, Narnian kid—anymore. Either way, the fact that he's also the villain makes us think we're supposed to disagree.
| Quote #3
"Is he really as bad as that?" said Caspian. "Would he really murder me?"
"He murdered your Father," said Doctor Cornelius. (5.24-26)
Sometimes growing up means learning unpleasant truths about people and the world. Learning that someone wants you dead certainly qualifies as unpleasant, and this scene starts Caspian's journey towards growing up.