Moral development continues throughout the life span, even spawning dialogue of philosophical implications of such research.

Psychologists
Lawrence Kohlberg
American psychologist (1927-1987) who extended Piaget to moral judgment, proposing six stages from preconventional to postconventional. Known for the Heinz dilemma and Just Community Schools, critiqued by Carol Gilligan.
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Lawrence Kohlberg's Other Quotes
The Heinz dilemma exposes not the choice a person makes, but the structure of reasoning that justifies the choice.
Right action tends to be defined in terms of general individual rights and standards which have been critically examined and agreed upon by the whole society.
The aim of education should be development.
Only by settling our differences with other members of the group can we actually understand the shortcomings of our own beliefs.
Related Quotes
There is but one truly serious philosophical problem, and that is suicide.
-- Albert Camus
There is but one truly serious philosophical problem, and that is suicide.
-- Albert Camus
True philosophy consists in relearning to see the world.
-- Maurice Merleau-Ponty
The man who dies rich dies disgraced.
-- Andrew Carnegie
A sunao (open) mind sees the truth of things without being trapped by preconceptions.
-- Kōnosuke Matsushita
Once we realize that imperfect understanding is the human condition, there is no shame in being wrong, only in failing to correct our mistakes.
-- George Soros