Some individuals, especially men, keep growing well into their 20s.
Researchers at the Royal Children's Hospital in Melbourne, Australia, say that many are choosing to delay the responsibilities of adulthood.
Initially when children begin to have social interactions with others, mainly the caregivers, they misinterpret that they are one entity, because they are together for a long duration of time and the caregivers often provide for the children's needs.
For example, a child may misattribute the act of their mother reaching to retrieve an object that they point to as a sign that they are the same entity, when in fact they are actually separate individuals.
Improvements in health and nutrition in the west mean the average child now begins puberty at 10 instead of 14.This means that some of the methods and practices used in child psychology could also apply, and help, older people.Hormonal changes continue into a person's twenties, too 'Some adolescents may want to stay longer with their families because they need more support during these formative years and that it is important for parents to realise that all young people do not develop at the same pace.'Commenting on the news, Kate Fallon, general secretary of the Association of Educational Psychologists added: 'Emotional development doesn’t just stop when we turn 18 and young people must be able to develop at their own pace and have access to appropriate support if they need it.Traditionally, adolescence was thought to last from ages 14 to 19, but scientists now claim this definition is 'overly restrictive'.Scroll down for video Adolescence now lasts from ages 10 to 24, scientists have claimed.