Intelligence is something that grows or forms in a social setting. There is something to be said about what people can do. The questions of whom are to be educated and who is to be schooled is not directly answered in the resources. Yet, in reading several Sternberg pieces it is evident that education is a continuous process. The entire population is a constantly being educated.
All social interactions provide opportunities for higher level thinking.
Throughout the education continuum all people experience purposive adaptation to, shaping of, and selection of real-world environments relevant to one's life. Students reach a kind of expertise at which he or she becomes a reflective practitioner who is able to consciously use a certain set of skills. But expertise occurs at many levels. People thus cycle through many times on the way to higher levels of expertise. The number of years of schooling is not a good measure of how much education a person has.