In girls, pubertal changes( adolescence) usually, begin _____ boys of the same age.
before
In girls pubertal changes (adolescence) usually begin before boys of the same age. Puberty is the period during which growing boys or girls undergo the process of sexual maturation. The onset of puberty varies from individuals to individuals. Puberty usually occurs in girls between the age of 10 to 14, while in boys it generally occurs later, between the age of 12 to 16. Even though girls reach adolescence earlier, by the time boys are 18 to 19 years old, they catch up and reach their adult stature.