I'm 16 years old. I went in to buy a PG-13 movie (specifically contagion) and they asked for my I.D.
Finding this odd for a PG-13 movie I reluctantly gave it to them, only to be informed that they wouldn't sell it to me because they said I have to be 17. I checked and it wasn't a special edition, so I should have been able to buy it perfectly fine.
Walmart lost my business, I went straight to Meijers to buy it for a dollar more. I will not be shopping at Walmart in the future for my movies.