State the age at which adolescence usually begins and the age up to which it lasts.
Adolescence usually begins around the age of 10 or 11 yrs and lasts upto 18 or 19 yrs.The period of adolescence varies from person to person.In girls adolescence may begin a year or two earlier than in boys.A person who is in the process of growing from a child to an adult is called an adolescence.