Should polyamory be exclusive to adults?

Why/why not?

Just curious about everyone's thoughts. Made a post in another forum that the teen characters' relationship problems could just be solved if polyam was written into the story, to which someone replied "they're teenagers, they can barely handle one relationship at a time."

Personally I think teenagers and adults are both capable of learning the skills and communication needed for polyamory, when given the right resources and when the desire is there. Monogamy is just so engrained in our culture that people don't really consider there are alternatives that could work if society wasn't outlined in a certain way.