Psyc 357 ch1- themes and issues in adult dev and aging. Adult= all indivs who have reached a certain level of physical, psychological and social maturity. Identity= composite of self representations in biologica, psychological and social domains. Interaction of domains as interpreted in terms of indiv"s view of self forms central organizing concept w/in biopsychosocial persp. Principles of adult dev and aging= o o. 1= changes over the lifespan are continuous (build on previous changes) Ppl often look at external changes first, whereas you don"t feel you change much on the inside (still the same person) but you change immensely on the outside. 2= in order for ppl to become old, they have to not die (survive) 5 ways to shorten your life= being overweight, drinking and driving, eating inadequate fruits and veggies, being physically inactive, smoking. Some ppl who survive longer do have certain characteristics that allow them to do so o.