This is a mid Z speakin ('05) and I agree with that the electropop era was geared towards millennials. I feel though that at the same time mainstream music wasn't fully geared towards post-millennium kids until 2015/2016, when hip hop surpassed pop and rap became pretty huge again. Therefore if we think of Y culture as culture geared towards them, the mid 10's are a great way to divide the line.The electropop era (late 2008-mid 2013) does sum up the Late Y era. The core 00s era, which came before it, was Core Y. The core 10s era, after it, is either Early Z, or a cusp era. I kind of still think that this era is still Early Z, until about 2021.
What is your definition of Early, Core, and Late Y?
Is it like 1981-1985 as Early Y, 1986-1992 as Core Y, 1993-1996 as Late Y, or something different?