It seems like you would have to wear them a lot to lose the ability to filter out noise naturally. Five hours seems insufficient, even for a teen. Maybe if you wore it all day? I want noise-canceling headphones that filter out all non-natural sounds. I want to hear the birds but not people talking or leaf blowers or trucks going beep beep beep. Maybe smarter headphones are the answer (besides, of course, making the world not so damn obnoxious).