Generations. How are they properly defined?

Generations. How are they properly defined?
Generations. How are they properly defined?

People can't seem to agree on this, and a good example of this are the charts above. For example, the top chart has Millennials as having been born between the years 1981 to 1996, but the one below has 1982 to 2000. So which is it?

Also the years don't match. Boomers were born over an 18 year timespan, but Gen X has only 15 in the first chart and 16 in the second. Why?

Generations. How are they properly defined?
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