Scientists have changed their [estimating / estimation] of when adolescence ends and adulthood starts. Adolescence is that difficult time when children develop [onto / into] adults. It was traditionally thought to [coincide / coincidence] with our teenage years. However, scientists from the University of Melbourne have redefined [these / this] . They say it can start at the age of 10 and continue [for / to] the age of 24. Puberty used to occur [around / rounded] the age of 14, but because of [improved / improve] health and nutrition, puberty can now start at the age of 10, especially in the developed world. Likewise, the [upper / up] age for when adolescence ends has been increased. This is because we stay [on / in] education longer, and delay responsibilities like [marriage / married] , parenthood and getting a job.
The scientists [published / publication] their study in the "Lancet Child and Adolescent Health" journal. They say [society / societal] needs to change laws to take [into / onto] account the [findings / funding] of the research. Professor Susan Sawyer said: "Although many adult legal [privileges / prevails] start at age 18, the adoption of adult roles and responsibilities [generality / generally] occurs later." The researchers say youth support services could be [extended / extension] to the age of 25. However, this could be [problematic / problem] in many countries around [a / the] globe. There is a big difference in the legal age at which nations [recognize / recognition] adulthood. Children legally become adults at the age of 15 in Indonesia, Myanmar and Yemen. In Singapore, Zambia and Honduras, the age is 21.