Problem: A nurse assesses an older adult client. During the interview, the family expresses concern because the client's "ability to figure out what is going on" has deteriorated. However, the client remains wise and continues to give solid life advice. Which theory explains this phenomenon? Need Professional Help? • Cognitive skills of older adults are better than younger adults under some conditions. • Crystallized intelligence declines with age. • Cognitive abilities are impaired by the client's cardiovascular disease. • Mild cognitive impairment begins with cognitive dissidence.