Boys grow their fingernails long because they don't want to bother cutting them. Girls are attracted to boys, even at an early age. At an early age, boys are attracted to dirt. Baby girls often talk earlier than boys do. Before boys talk, they learn how to make machine-gun noises.
Girls turn into women.
Boys turn into bigger boys called men. I haven't gossiped. I haven't lost my temper. I haven't lied or cheated. I haven't been greedy, grumpy, nasty, selfish or overindulgent.