> 12 and 25 years Still a low spread. No overlap is also weird, insofar that generations are supposed to be real phenomena and not just an arbitrary division.

> 12 and 25 years Still a low spread. No overlap is also weird, insofar that generations are supposed to be real phenomena and not just an arbitrary division. > No that's not where they originated from. How much does their current incarnation owe to whatever came before? > The Millennial/Gen Y group does correspond to a boomlet. You need to look at that children/potential mother rate. Constant means pure echo. Secondary crest further either shows we have more mothers and they mimick their own mothers in having more kids, a true cultural inheritance, or it shows that there is enough variation in maternity age that generations are sufficiently convolved such that no 1 generation begets the next. Those two can maybe be teased apart by combining the per-whole-population and per-potential-mother rates to get the mothering/potential mother rate. Has anyone actually done any of these statistics?