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老年人细菌性肺炎与年轻病人比较有下列临床特点:(1)发病率较高;(2)住院时间较长;(3)容易发生菌血症、脓胸、脑膜炎和呼吸衰竭等并发症;(4)病死率较高;(5)症状和体征不典型;如综合文献报告老年病人中40％～65％体温不高,而年轻病人有20％～25％;45％～50％出现谵妄和其他精神症状,而年轻人为15％～30％; 50％～65％不咳嗽无咳痰,而年轻人只30％～35％;70％～80％无胸痛,而年轻人为35％～50％;20％～25％无肺部啰音,与年轻人相同;但呼吸急促或呼吸数次增加以及白细胞数增多的出现率却比年轻人高。
Bacterial pneumonia in elderly patients compared with younger patients have the following clinical features: (1) higher incidence; (2) longer hospital stay; (3) prone to bacteremia, empyema, meningitis and respiratory failure and other complications ; (4) a higher case fatality rate; (5) atypical symptoms and signs; as reported in the literature 40% to 65% of elderly patients are not warm, while younger patients have 20% to 25%; 45% to 50% Delirium and other psychiatric symptoms, while young people 15% to 30%; 50% to 65% do not cough without expectoration, while young people only 30% to 35%; 70% to 80% without chest pain, while young people 35% 50%; 20% to 25% without pulmonary rales, and young people the same; but shortness of breath or breathing increased and the number of white blood cells increased the incidence of higher than younger people.