People stop growing at many different ages, but for most people the age limit is about eighteen or nineteen.
Thus, a person who continued to grow right after high school would be well within the normal range.
In some unusual cases, people can continue to grow until about the age of twenty, and in people without estrogen or estrogen receptors, growth can continue well into the twenties.
Growth, both normal and abnormal, is under the control of a battery of hormones, including human growth hormone from the pituitary gland, thyroid hormone and the hormones involved in sexual development.
Usually, there is a preadolescent growth spurt that begins at about the age of ten in girls and around twelve in boys.
It tends to reach its peak about two years later, with annual growth rates of three to four inches.
The rate then slows down; by the time of a girl’s first menstrual period and by the end of a boy’s growth spurt, adult proportions and body shape have emerged.