In general, most people stop growing taller by the time they reach their late teens or early twenties, with the average age being around 18 for girls and 20 for boys. Boys typically experience a growth spurt during puberty, typically between the ages of 12 and 15, says Healthline. During this time, boys can grow several inches taller each year, with the most rapid growth occurring around age 13.5, as explained by the MSD Manual. However, growth rates can vary widely during puberty, and some boys whose physical development is delayed may continue to grow more slowly until normal height is reached, says the source. Girls typically experience a growth spurt during puberty, often between 9.5 and 13.5 years old, and grow around 3½ inches during the maximum-growth year.
Once the growth plates in the bones fuse, growth stops completely. This usually occurs around age 15 to 17 for boys and 13 to15 for girls, per Nemours Kids Health. However, this may vary based on individual factors.