WHO defines adolescent age between :
WHO / UN Definitions: Adolescent age = 10-19years Youth - 15-24 years Young people - 10-24 years Ref: Ghai Essential Pediatrics By O. P. Ghai, Piyush Gupta, V. K. Paul, 6th Edition, Page 66; Cambridge Handbook of Psychology, Health and Medicine By Susan Ayers, Andrew Baum, Chris McManus, 2007, Page 5
10-19 years of age
10-14 years of age
10-25 years of age
9-14 years of age