There are various sanctions associated with age inappropriateness, ranging from social isolation, damage to physical health and cognitive development, and forming of improper behaviour.
They usually develop the social and mental skills needed to play peekaboo by the age of 8 months.
[10] Students prefer to associate with those similar to them in various dimensions, such as age, gender, race, educational attainment, values, interests and/or beliefs, etc.
Therefore, normal students with age-appropriate social skills are more likely to gather together, building up friendships and cohesive groups within peers.
Their lack of contact with peers, underdevelopment of age-appropriate social skills, and negative self-concepts result in externalizing, such as aggression, and internalizing problems, such as anxiety.
Some students are older-within-cohort, which means they fall outside their cohort's standard 12-month age range, either because they are forced to hold back or voluntarily postpone the entry.
The nativist and social constructivist stand for retention since they believe it prepares children for school, predicting better academic performance.
These findings stand for environmental and interactionist views, enhancing the importance of age appropriateness in children's development.
[13] Various content rating systems have been developed to prevent the harm that age-inappropriate media presentations bring to children.