Early maturation often affects boys positively and girls negatively so far as social cooperativeness is concerned. Eriksen suggested identity may become confused, or strong. A complication here is that in different situations we may have different levels of resolution of our identities. Social relations with friends are important in adolescence, with girls perhaps emphasizing friends as confidants with whom to discuss appropriate behaviours, and boys emphasizing friends as allies with whom to establish independence. But moods are quite variable, within hours, one study noted.
Adults have many possible paths to tread.
Loss of memory and other cognitive functions, with the prognosis of becoming bedridden. The brain degenerates. Generally studies of those over 70 show declines. The themes of adult life are LOVE and WORK, generally. Early marriage years are notably happy, as are first years of childrearing.