Demographers started using the term “Baby Boomers” for those born during the postwar baby boom [in the West: the former USSR never saw that boom to that extent because so many Russian men of reproductive age fell on the Eastern Front]. The terms for subsequent generations emerged gradually, and overzealous sociologists and journalists make much of real and imaginary divisions between those generations.
[Full disclosure: I was born on the conventional seam line between “boomer” and “Generation X”, yet I’ve never really identified much as either.]
But perhaps a more meaningful definition might be possible: not by birth years, but by technologies you have never truly known life without, and which you have always taken for granted. Those generational cohorts may vary by geographical location, as some regions of the world were earlier or later adopters of a given technology.
- Generation Radio: the latter half of so of the Greatest Generation, and definitely the Silent Generation, never knew a world where radio and wireless communications weren’t a thing.
- Generation TV: have never known a world without television. For the US that would be essentially all “boomers”, but even in the West, TV broadcasts were only widely watched rather later. (Sure, there were experimental broadcasts in the UK by Baird, and in Germany by Nipkow, even before WW II, but I’m talking about a technology being a part of daily life for most.)
- Generation PC: have never (really) known a world without personal computers. [By that criterion, I’d be clearly generation TV but not generation PC, as the first time I could lay my grubby hands on an early Commodore computer was in my junior year in HS.]
- Generation Internet: never knew a world without online access. [My daughter would qualify, as we had internet access (however slow) from when she was a toddler.] France is a tricky case here, since it had a pretty sophisticated pre-Internet messaging system called Minitel, but because of that was comparatively late to the broader Internet.
- Generation Always On: never really knew life without ubiquitous online access (via smartphones or more powerful devices).
Or perhaps replace “never knew life without X” by “always had X in their formative years” in all of the above.