For me, here's how the subdivision goes: Hulkamania era starts at the start of 1984 and ends at KotR 1993. Then it's New Generation until WM14 (with a transition period between WM13 and 14). Attitude lasts until the end of 2001, then it's Ruthless Aggression until after SummerSlam 08. The PG Era takes place and finishes at WM30. The "Reality Era" is a WWE distinction, and I wouldn't call it any different from the "New Era". I'd consider those two names to last until WM35. Then there's an era I don't have a name for, that's defined by the pandemic, the existence of AEW, growing discontent within WWE. Then HHH takes over from SummerSlam 22 and that's the "post-Vince" era