Typically, in other content industries, from literature to movies to music, the release date is the start date, not when the creator started thinking about it or started thinking harder about it. For games, it's typically the date the game goes out of beta into full release. I think you'd tend to get odd looks by claiming your MUD has been around since before it was open to the general public, though I tend to agree with you and say that the quality of a MUD is not particularly linked to how long it's been around. World of Warcraft is sure enjoyed by a lot of people, and it's only a year old.
--matt
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