It is not until that people can integrate separate and distinct attributes into an holistic, abstract representation of the self.

Middle childhood

Explanation:

Younger children tend to have concrete ideas about themselves, for example if you ask a 5-year-old to describe himself, he will likely describe their appearance or their clothes, this are pretty concrete aspects of him. On the other hand, a teenager would answer the question telling you about their values, for example.

According to research in psychology, the change in this kind of descriptions tends to occur during middle childhood (ages 6 to 12) where kids start seeing themselves as more than concrete things but start integrating separate attributes into an abstract representation of themselves.

the technology changed agriculture in an impacting manner since many people left the field work by a cellular or other technological appliances