MS explains Marketplace age restrictions
We've received more than a few comments and emails concerning Xbox Live Marketplace age restrictions. Specifically, Live members that are under the age of 18 are unable to download trailers and demos for M rated or unrated games. Naturally, this is disappointing to many Live gamers looking to download, say, the Kane & Lynch demo from XBLM. Major Nelson has posted an explanation for this restriction on his blog. Essentially, you can blame the ESRB. Demos and trailers are considered advertising and aren't made available to gamers under 18 in accordance with ESRB guidelines. Major Nelson notes that the same guidelines apply to the Playstation Store and Wii Shop Channel as well, so the 360 isn't by itself in this matter. So there you have it.