Submission + - Elon Musk claims of SSN fraud shows his ignorance of data (usatoday.com)
An audit in 2015 found that exactly 266 individuals over the age of 112 were receiving benefits. Of those 253 were found to be not actually over 112 with only 13 individuals recorded with the correct age. Social Security benefits however terminate at age 115.
As for his second claim of duplicate SSNs, without further context, it is difficult to assert that duplicate SSNs in a database is even a problem. For some types of data like contribution and payment records, duplicate SSNs is normal as one should expect multiple records can exist for one unique SSN.