A brain disease occurring in old age characterized by memory loss, personality changes, and physical or mental impairment, most commonly referring to Alzheimer's disease.

senile dementia, a brain disorder that causes a slow decline in memory, thinking, and reasoning skills in older adults

Disease caused by brain tissue degeneration in old age; also known as [[老人痴呆症|老人痴呆症|lao3 ren2 chi1 dai1 zheng4]], [[老年痴呆症|老年痴呆症|lao3 nian2 chi1 dai1 zheng4]], or [[老人失智症|老人失智症|lao3 ren2 shi1 zhi4 zheng4]]