What is Age varieties?

What is Age varieties?
【正确答案】：对he way language is used correlates, to a greater or lesser
degree，with the age of individual speakers. The importance of age as
a social factor in language variation is strikingly demonstrated by
children’s language as it develops with age. As a rule, children before
the age of two have a very limited vocabulary，imperfect phonology，
and extremely rudimentary syntax. When they reach the age of five，
their syntax becomes more standard，but their vocabulary is still limited.
Ten-year-old children, in contrast, have a comparatively extensive vocabulary，and the structure of their utterances does not differ significantly from that of adults' speech. While some differences in pronunciation are found to correlate with different generations of speakers, the most striking differences are lexical. Lexical variation according to the age correlates with time periods and therefore，is more noticeable across three-generation time span than tw o generation time span. For example, an elderly man who still talks about the “icebox”or the “wireless” may be confused by some of the speech of his teenage granddaughter who likes to “pig out” on whatever she sees in the “fridge” while listening to her “boombox. ”In general, old people tend to be more conservative than the younger generation in their speech habits, and feel more at home using older words, incorporate fashionable terms less readily into their vocabulary, and prefer to use certain structures that their children have abandoned.