SableWyvern
Cruel Despot
Well, we're pretty sure that the majority of players are 18 years old or older. Most evidence points to this. While there are significant numbers of teens playing, that demographic is dwarfed by older demographics.
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From: this thread: WotC - Comparing EN World's Demographics to the D&D Community's
So, assuming that new DM's would be adults isn't too much of a stretch. Again, sure, there are new DM's under 18. After all, according to the above, a quarter of players are under 18. But, again, we're talking about a minority of players. While @EzekielRaiden didn't bring receipts to say that the majority of gamers are adults, I wouldn't have really thought that he had to. It's hardly controversial.
Now, as far as people choosing to DM after playing for some time, again, I don't think that's terribly controversial. That's how things have worked in the hobby for a very long time. New player gets introduced to the game through existing gamers, tries it, likes it, and then goes on to try running games.
If we assume those numbers are accurate (although it looks like there's no mention of how WotC sourced them), then "most" is a technically correct term but, in the context of the discussion we're having, it's being used to dismiss the younger people as irrelevant to the discussion. If 25% are under 18 and 42% are 24 or less, I'm not sure that's reasonable.
By sheer dint of numbers and normal group dynamics its unavoidable that a good number of GMs played before they GMed. But the comment I was responding to didn't say, "a large number of GMs were players first". It stated that most GMs played for several years before becoming GMs, and with nothing to back it up, that sounds to me like a fact plucked out of the air.Do you honestly believe that most people who DM D&D have never played before they try running games? Or even a majority or people?