>> patrick o'carroll: i guess, the best way to say it is as accurate as it can be. >> pelley: patrickoll is the social security administration's inspector general. his office investigates how the death master file is used and abused. >> o'carroll: right now, the death master file has in it about 86 million records in it and it gets about two million records every year from the states. and we're probably, as with everything else, as strong as the weakest link, in terms that some states are reporting electronically, have very good data. and then with other states, it's done on a more haphazard level. so again, there's going to be some falling through the cracks there. >> pelley: but o'carroll told us that live people "falling through the cracks" isn't what keeps him up at night. the much more costly problem is in the millions of americans who do die and are not recorded. your office found that social security had no death data for six and a half million people over the age of 111. do you really believe that there are six and a half million people over the age of 111 in this country? >>