Posted January 25th, 2017, 11:36 PM
Informed deduction, actually. The US govt started requiring passports for travel in 2007, they are good for 10 years, that means that millions of passports are expiring this year. to give you an idea, in 2006 there were a little of 12 million passports issued. in 2007, there were over 18 millions.
2007 was not the first year passports were required, maybe for cruise travel. Many others have had passports prior to 2007, so their's have already been renewed and have different expiration dates. Also not everyone travels often enough that they routinely renew either.