"Personal change, growth, development, identity formation--these tasks that once were thought to belong to childhood and adolescence alone now are recognized as part of adult life as well. Gone is the belief that adulthood is, or ought to be, a time of internal peace and comfort, that growing pains belong only to the young; gone the belief that these are marker events--a job, a mate, a child--through which we will pass into a life of relative ease."