What is criterion for a game being considered retro/classic/old(school)?

[richardhutnik]

Derek said:

infamous8 said:
2D graphics

Arcade style game play...ie, light on story and cutscenes, but heavy on fast paced game play. Easy to get into. Street Fighter 4 being a good example.

This is a myopic view, but may just tell us more about your tastes than anything else.  "Old school"/"Classic" games didn't really have cutscenes, sure.  But that didn't mean they were light on story. 

 Oh, and to the OP... Retro != Classic/Old School.

Retro, classic and "old (school") are found in the same area.  If you want to differentiate between them, feel free to.

I was asking to discuss this, because there are people who don't consider Neo-Geo games to be "classic" or "retro" or "old (school)".