For a while, I thought it would be impossible to make a definition for retro games. On all the forums I visited for researching this topic, everybody starts giving their own opinion. And some are very different then others.
Honestly, it’s a combination from factors that decides when a game is retro. But I think I found a great indication for looking if a game is retro or not. The sales graph.
Think about it, if you look to a sales graph, you first get the early adapters who buy the game without looking to reviews. They are extremely hyped and they want to product. If you look to an usual sales graph, there is a point where it goes down in sales. In OUR point of view, I think you can say that a game is then starting to get retro. Logical or not ? :-)