Age difference in dating teenagers
Males experience their growth spurt about two years later, on average, than females.
During their peak height velocity (the time of most rapid growth), adolescents grow at a growth rate nearly identical to that of a toddler—about 4 inches (10.3 cm) a year for males and 3.5 inches (9 cm) for females.
This non-uniform growth is one reason why an adolescent body may seem out of proportion.
The first places to grow are the extremities—the head, hands and feet—followed by the arms and legs, then the torso and shoulders.
The end of adolescence and the beginning of adulthood varies by country.
Furthermore, even within a single nation state or culture, there can be different ages at which an individual is considered mature enough for society to entrust them with certain privileges and responsibilities.
Puberty is a period of several years in which rapid physical growth and psychological changes occur, culminating in sexual maturity.
The average age of onset of puberty is at 11 for girls and 12 for boys.