Historically, children who were identified as gifted and talented were taught with children of the same mental age, not their chronological age. This practice was called , but it is seldom used today

Acceleration.

Explanation:

Just as it is been explained above, acceleration directs guidance from wards and tutors to mentor children with special abilities that are seen in the form of talent differently with their likes and not their normal class and age mates. This is randomly seen in a group of adolescents in certain ways which are been seen physiologically, cognitively and also culturally.

A certain cultural aspect also classify with their body mass index, though some could be very short, attained their sexual maturity etc.