Scientists have changed their of adolescence - the when children develop into . It used to be around our teenage , but now scientists say it can be between the of 10 and 24. Puberty started around the age of 14, but health means it can start four years , especially in the developed world. Adolescence now ends because we stay in education longer, and delay things like , parenthood and working.
The published their study in a journal. They say needs new laws for adolescents. A said: "The of adult roles and responsibilities occurs later." They suggested extending youth support . This could be a because there is a big in the legal age at which recognize . In Indonesia and Yemen it is 15, but in Singapore and Zambia, the age is 21.