Teenagers and their younger siblings grow bored quickly. It's their job to figure out how not to be bored.
Life is filled with dull meetings and duller people and many empty moments. Either you hate a large part of your duties in life or you figure out ways to make that time interesting for you. Boredom is a wake up call for us to get involved in process of life.
As Scott Peck wrote in The Road Less Traveled, "Mental health is an ongoing process of dedication to reality at all costs." Embracing what we are handed and then turning it into something worthwhile is a lifelong struggle. We all face it.
It isn't the job of parents to keep children entertained. The kids' job is take charge of their own situation to figure out what captivates them. Parents just need to provide opportunities for their kids and a sense of direction to help them discover what works.
If we are not in the hunt for the compelling, we are not in the game and will certainly be miserable people. There's no one to blame but ourselves. There are many escape attempts from the dullness of life that can temporarily distract us. It takes something meaningful and awe-filling to engage us over the long run.