Among them, the oldest is 21 years old. They are all cousins in a big family and eight of them are from rural areas.
在他们之中，年龄最大的是21岁。他们是一个大家庭的表兄妹，其中8个人来自农村。
The life expectancy of the oldest old in the city and town are longer than that of the rural, but the proportions of health expectancy in expectancy of the urban are shorter than that of the rural.
城镇高龄老人预期寿命高于农村高龄老人，但其健康预期寿命、健康预期寿命占预期寿命的比重却低于农村高龄老人。
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