This is remarkable. According to an article in the Chicago Tribune from earlier this year, a single family received 445 credit card offers, including 35 that were addressed to his kids, ages 8 and 11. The offers weighed in at a total of 23 pounds, and included pitches for 0% balance transfers, free airline miles, etc.
So… In case you still needed to be convinced, this is a great example of why you should opt out of credit card offers. If nothing else, just think about how much waste you’d be saving.