The idea of childhood as a social invention, in retrospect, is hardly credible. In the Bible, in writings of the Greeks and Romans, and in the works of the first great educator of the modern era, Comenius, children were recognized as being both different from adults and different from one another with respect to their stages of development. To be sure, the scientific study of children and the increased length of life in modern times have enhanced our understanding of age differences, but they have always been acknowledged.

Taking the child's point of view demands good will, time, and effort on the part of parents. The child is the clear beneficiary. Parents who make the effort to understand their children's point of view are likely to treat children fairly and in an age-appropriate manner.

Friendships in childhood are usually a matter of chance, whereas in adolescence they are most often a matter of choice.

It makes little sense to spend a month teaching decimal fractions to fourth-grade pupils when they can be taught in a week, and better understood and retained, by sixth-grade students. Child-centeredness does not mean lack of rigor or standards; it does mean finding the best match between curricula and children's developing interests and abilities.

We now recognize that abuse and neglect may be as frequent in nuclear families as love, protection, and commitment are in nonnuclear families.

I believe the important thing is to continue to create new experiences. That's why so many retired people travel. New experiences raise our consciousness and stimulate cognition. Retirement offers the opportunity to learn new things, and that is what keeps you young, at heart at least.

Young children learn in a different manner from that of older children and adults, yet we can teach them many things if we adapt our materials and mode of instruction to their level of ability. But we miseducate young children when we assume that their learning abilities are comparable to those of older children and that they can be taught with materials and with the same instructional procedures appropriate to school-age children.