I'm trying to teach the little kids to say "I'm three years old" when someone asks them "How old are you?" and it's been going surprisingly well. The tricky thing for them is distinguishing between "How are you?" and "How old are you?" so sometimes when you ask them "How are you?" they now say "I'm three years old!" It's adorable, but we're working on it.
Today was especially funny though because I asked "How old are you?" to the entire class, and everyone responded "I'm three years old!" except for one little boy who stood up, put his hands on his hips and yelled at me "I'm FOUR years old!!" and then angrily waved 4 tiny fingers at me. I lost it. I don't think I'm supposed to be laughing at my students so often, but dangit, they're too cute!