People born in 1990 are the last 90s kids?
before 1991, most people spent over half of their childhood in the 1990s. once you get to 1991, the balance shifts more toward having a childhood rooted in the 2000s instead.
overall, it makes sense to place younger millennials starting around 1991. They were also too young to vote in the 2008 election, which is considered the defining millennial election. entering adulthood and voting for the first time in 2012 feels noticeably later compared to older millennials.
1987-1990: core millennials. first eligible election: 2008. spent more than 50% of childhood in the 1990s. 90s kids.
1991-1994: young Millennials. first eligible election: 2012. spent less than 50% of childhood in the 1990s. last group with meaningful memories of the 1990s.
1995-1998: zillennials / Gen Z, first eligible election: 2016, primarily spent childhood in the 2000s