2021高考英语全国乙卷（即全国卷I）的阅读理解B中出现了 Generation X, Generation Xer, Generation Y等词语，查词典查到：

Generation X：the group of people in the U.S. who were born during the late 1960s and the 1970s  X一代（指美国20世纪60年代末至70年代出生的人）

Generation Y：the group of people who were born between the early 1980s and the end of the 1990s, who are mainly the children of the baby boomers and who are regarded as being very familiar with computers and electronic technology  Y一代（20 世纪 80 年代初至 90 年代末出生的人，被认为对电脑和电子技术非常熟悉）

哪位专家老师可以介绍一下 Generation X, Generation Xer, Generation Y 有关的背景知识吗？非常感谢！

附：2021高考英语全国乙卷（即全国卷I）的阅读理解B如下：

When almost everyone has a mobile phone, why are more than half of Australian homes still paying for a landline (座机)?

These days you’d be hard pressed to find anyone in Australia over the age of 15 who doesn’t own a mobile phone. In fact plenty of younger kids have one in their pocket. Practically everyone can make and receive calls anywhere, anytime.

Still, 55 percent of Australians have a landline phone at home and only just over a quarter (29%) rely only on their smartphones, according to a survey (调查). Of those Australians who still have a landline, a third concede that it’s not really necessary and they’re keeping it as a security blanket—19 percent say they never use it while a further 13 percent keep it in case of emergencies. I think my home falls into that category.

More than half of Australian homes are still choosing to stick with their home phone. Age is naturally a factor (因素)—only 58 percent of Generation Ys still use landlines now and then, compared to 84 percent of Baby Boomers who’ve perhaps had the same home number for 50 years. Age isn’t the only factor; I’d say it’s also to do with the makeup of your household.

Generation Xers with young families, like my wife and I, can still find it convenient to have a home phone rather than providing a mobile phone for every family member. That said, to be honest the only people who ever ring our home phone are our Baby Boomers parents, to the point where we play a game and guess who is calling before we pick up the phone (using Caller ID would take the fun out of it).

How attached are you to your landline? How long until they go the way of gas street lamps and morning milk deliveries?