一、年龄等级在人类所有的社会中,均把其成员按年龄加以区别。在英语中有诸如“婴儿”、“少年”、“青年”、“丁龄”、“成人”、“老年”的称谓,都是表示年龄分群,只是含义不甚确切。这些按年龄的称谓在一些社会中缺乏明确的界限,我们仔细分析,就会发现有某些重叠。如“青年”和“丁龄”事实上划分为同一个年龄时期比较合适,不过大多数情况下,它们是不完全相同的。我们可以把“丁龄”以前的人划为“青年”的范围中去,把某些“丁龄” I. CLASS OF HISTORY In all human societies, members are distinguished by age. In English, there are appellations such as “baby”, “juvenile”, “youth”, “Ding Ling”, “adult” and “elderly”. These age-specific titles lack a clear boundary in some societies. After careful analysis, we will find some overlap. For example, “youth” and “Ding Ling” are actually divided into the same age group, but most of the time, they are not exactly the same. We can classify the people of the “Ding Ling” group as “young people” and put some “Ding Ling”