It is possible, just possible, that the ex wife is listed in the Soc Sec records with your husband as she may be able
claim based on his earning records. So if Soc Sec has her name, and his address.... None of that means that the ladies at your door were legit, just that there can be a real reason for her name and his address to be in a record together. Apparently the government makes the names and birth dates of those nearing Medicare age available as I certainly received LOTS of mail offering various insurance options. It could be that this is compiled from other than the Soc Sec Adm, such as using voting records or driving license records which would also contain addresses and ages.