This is boring!!

My son has learned an exciting new word, "BORING." I can only assume he learned from day care of pre-school. He starts playing with a toy or game and then in a somewhat sad voice, "This is boring," or "This game is boring." This was a shock as he said it properly and with such teenager sound behind it. As we say 3 going on 13. My thought is if he acts like a teenager now what will he act like when he is a teenager?