octogenarian meaning in English

adj.,n.
八十岁的(人)，八十多岁的(人)。

It is as though a martian came to visit earth and landed in an old - age home where everyone was an octogenarian
这好比火星人造访地球，却降落在养老院，触目所及尽是80多岁的老人。
The octogenarian , who is a vegetarian and has never smoked cigarettes or drunk alcohol , is ready to share his knowledge with others
这位年近九旬的老人是一名素食主义者且从来不抽烟或喝酒，他准备将自己的养生之道与他人分享。
To return to our earlier analogy , if the martian became accustomed to a world exclusively populated by octogenarians and then was suddenly presented with a group of babies , he might ask for proof that these babies and the senior citizens were even the same type of creature
回到我们先前的类比，如果火星人已经习惯了只有80岁人口的世界，忽然出现了一群婴儿，他可能会要求一些证据，证明婴儿与老年人是否为同一类的生物。