Boys begin puberty sometime between the ages of 9 and 14. Boys hit puberty about two years later than girls. However, Black and Hispanic boys tend to enter puberty a bit earlier than white boys. If your son starts showing signs of puberty before age 9, it’s worth asking his pediatrician about these early changes. Similarly, if no signs of puberty have happened by age 15, it’s worth asking his pediatrician about this delay.