I don't remember there being ratings on games at the time I was a minor. The ESRB supposedly started in 1994, but I don't remember titles like Doom (I played the SNES version, as I didn't have a computer at the time) having a rating at the point I first played them. Same with Mortal Kombat, and I played both the cleaner SNES version and the Sega Genesis version.
I've been playing violent video games since the early 90s, though.
I've been playing violent video games since the early 90s, though.