Which statement correctly describes an important nursing consideration when treating elderly clients?

A. Elderly clients become "ultrarapid metabolizers" of all CYP enzymes: Metabolic changes in older adults are variable and enzyme-specific. Some cytochrome P450 (CYP) enzymes may have reduced activity, while others remain unchanged or even increase slightly. The statement that all CYP enzymes are ultrarapid is inaccurate, metabolism depends on the specific enzyme pathway. B. This client population consists of people 50 years of age and older: The elderly population is generally defined as adults aged 65 years and older, although definitions can vary slightly in certain studies. Using 50 years as a cutoff inaccurately broadens the category and may misrepresent age-related pharmacologic considerations. C. Drugs tend to stay in the body longer: Age-related physiologic changes, such as reduced hepatic metabolism and decreased renal clearance, can prolong the half-life of many medications. This increases the risk of drug accumulation, adverse effects, and toxicity. Nursing considerations include careful dosing, monitoring for side effects, and adjusting therapy based on pharmacokinetic changes. D. Elderly clients will always have poor renal function: Renal function declines variably with age, but not all elderly individuals experience significant impairment. Glomerular filtration rate and creatinine clearance should be individually assessed, as some older adults maintain near-normal renal function despite age-related changes.