One of the major assumptions of the life-span approach as suggested by Baites, (1987) is that development is a ‘life-long process’ by this he meant that developmental changes occur throughout a person’s life, from the point of conception till death (Sugarman, 1986). (Baltes, (1987) went on to state that development as a life-long process assumes that, no point in a person’s developmental life is more important than the other, every period of a person’s life is equally important weather it is childhood or aging, they are all important periods of development though this assumption is in direct contradiction to other theorists of human development such as Freud who believed that development ends at childhood and that adulthood is an extended version of childhood and that aging is more of “loss in adaptive capacity” hence does not qualify to be put in the paradigms of development . This has constituted the gain and loss argument (Baltes, 1987). Research on intelligence has shown that other forms of intelligence which involving reviewing of one’s life and wisdom emerge in old age and these forms of intelligence are not ‘genetically wired from birth” as suggested by Freud and (Baltes, 1987). This goes to show that development is not restricted to certain periods
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