senility

n [U] state of being senile 衰老的状态.

senator, senatorial, send, send away for, send for, send for sb., send in, send off, send out, send round, send sb. doing sth., send sb. to school, send up, send-off, send-up, sender, senescence, senescent, senile, senile dementia, senior, senior citizen, senior high school, seniority, senna, senor, senora, senorita, sensation, sensational, sensationalism, sensationalist, sensationalize, sensationalise, sensationally, sense, sense-organ, senseless, senselessly, senselessness, sensibility,