The "after-eighty generation" refers to people who were born between the years 1980 and 1989. If we think about time as a big line, imagine that the year 1980 is on one end of the line and the year 1989 is on the other end. Anyone born in between those two years is part of the after-eighty generation.
People sometimes like to talk about the after-eighty generation because they grew up in a different world than their parents did. For example, their parents might have grown up without cellphones or the internet, but people in the after-eighty generation were born into a world where those things already existed.
Being part of the after-eighty generation also means that many of these people came of age in the 2000s, which was a time of big changes in technology and culture. This is when things like social media, smartphones, and online shopping became more popular.
Overall, the after-eighty generation is just a group of people who were born in a specific time period and have shared experiences because of that.