Late adulthood begins around age 65. According to Erik Erikson, this stage involves finding integrity and meaning in life rather than despair. Four main changes occur in the brain: reduction of brain weight and gray matter, decline in dendrite density, and slower synaptic speed. Vision changes include presbyopia, reduced field, and increased risks of cataracts and macular degeneration. Sleep patterns shift and REM sleep decreases while eating habits become more rigid. Relationships provide social support and intimacy. Life reviews and reminiscence help achieve integrity by reflecting on life experiences and choices.