The most dramatic forms of age-related mental deterioration are neurodegenerative diseases, like Alzheimer's.

与年龄有关的心智衰退中，最严重的是神经退行性疾病，如阿尔茨海默症。

Only about 7% of adults over the age of 70 suffer from memory loss or more serious mental deterioration.

只有大约 7% 的 70 岁以上的成年人患有记忆力减退或更严重的智力退化。

Even new moderate movers were about three times more likely to age free of major chronic disease or mental deterioration than were inactive adults.

即使是跟年龄无关初级水平的健身者比不活动的成年人对主要常见慢性身体疾病或者精神损伤有三倍的免疫力。

Senescence is the process of becoming old – which includes all the physical or mental deterioration that comes along with age.

衰老是变老的过程——包括随着年龄增长而出现的所有身体或精神退化。