Bite me EA there is no GEN4 in 2013

Gen 1: Magnavox, Coleco,
Gen 2: Atari, Apple 2, Comodore 64, Nes (JP)
Gen 3: Master System, Turo16 (Nes US & Eu)
Gen 4: SNES, Genesis NeoGeo, Jaguar
Gen 5: PS1, Saturn, N64
Gen 6: PS2, DreamCast, Gamecube, xbox
Gen 7: PS3, Wii, 360
Gen 8: WIU, PS4, XBONE

What do they say Gen4 means?  Did the universe start with the PS1?