Big Brother is emphasizing younger contestants because they are more likely to create drama

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The reason this season is almost entirely made up of 20-somethings is because they are more likely to be immature and volatile, says Julie Chen. "You need people that you think are not going to get along. We’ve found that the majority of the group being in their 20s works nicely, especially since it’s summer and everyone’s in bathing suits trying to impress," Chen tells Parade magazine. "Also, there’s a level of immaturity in your 20s; you’re still hotheaded and not that wise, so you’re going to act up and be more interesting to watch.”