Boys typically hit puberty between the ages of 9 and 14 years, with the average starting around 11 to 12 years old. This timeframe marks the beginning of physical and hormonal changes such as testicular enlargement, growth of pubic hair, voice deepening, and a growth spurt. Some boys may start earlier or later than this range, and that can still be normal. Key points about boys' puberty timing:

• Most boys begin puberty between 9 and 14 years.

• The average age is about 11 or 12 years.

• Puberty can last several years, with growth often continuing into the late teens.

• There is variation based on ethnicity, with Black and Hispanic boys sometimes starting earlier than white boys.

• The main visible sign usually starts with testicular growth followed by other changes.

Overall, boys hit puberty roughly 2 years later than girls on average.

This onset period is quite normal and wide-ranging, so slight variations in timing from child to child are expected and not usually a cause for concern.