WWII. There was such a large group of people born between 1945 and 1950, after the war ended, that they all push through the system at the same time. Woodstoc

WWII. There was such a large group of people born between 1945 and 1950, after the war ended, that they all push through the system at the same time. Woodstock music festival happened in 1969 right when everybody was in the their 20s or about to hit 30. Then they all had kids at roughly the same time, the 1970s and early 80s. Housing boom of the 1980s. Lots of new kids shows that happened in this time period as well. Now all of those kids are buying houses and having kids. Another housing boom.