According to Google’s talk of Robert Greene,
“Author of The Laws of Human Nature” I was drawn on the consideration he has that a Generations occur every 20 to 22 years, and there
are 4 generations living at every moment, as he describes from minute 50 on the video:
2
young generations (Progressives / Change Agents)
0-22 Years old &
23-44 Years old
2
older generations (Conservatives / "Skin in the game")
45-66 Years old &
67-88 Years old
The Spirit of the times (Zeitgeist) cycle of each of the 4 generations
follow this flow:
Gen1-Revolution generation like Baby Boomers / Hippies ~ born through 1945-1967
Gen2-Preserve generation like: Gen X / Xennials ~ born through 1968-1989
Gen3-Conservative generation like: Gen Y / Millennials / Gen Z ~ born through 1990-2012
Gen4-Crisis/New Revolutionary generation with new values, like iGen / Gen Alpha ~ born through 2013....
Some references online state generations on a more flexible criteria, as follows:
Which Generation are You?
Generation Name | Births Start | Births End | Youngest Age Today* | Oldest Age Today* |
The Lost Generation The Generation of 1914 | 1890 | 1915 | 104 | 129 |
The Interbellum Generation | 1901 | 1913 | 106 | 118 |
The Greatest Generation | 1910 | 1924 | 95 | 109 |
The Silent Generation | 1925 | 1945 | 74 | 94 |
Baby Boomer Generation | 1946 | 1964 | 55 | 73 |
Generation X (Baby Bust) | 1965 | 1979 | 40 | 54 |
Xennials | 1975 | 1985 | 34 | 44 |
Millennials Generation Y, Gen Next | 1980 | 1994 | 25 | 39 |
iGen / Gen Z | 1995 | 2012 | 7 | 24 |
Gen Alpha | 2013 | 2025 | 1 | 6 |
(*age if still alive today)
Source: https://www.careerplanner.com/Career-Articles/Generations.cfm