OK

I'm 66, getting SS and Medicare, and inundated with offers for various and sundry bullshit...
This one arrived in the mail today - a mailer from The National Processing Center, stating that "the Federal Government" has increased the taxable amount of your Social Security Benefits...which it not true.
They further state they can tell me how to avoid paying this increase but I must send them my personal information and phone number...

This is the latest incarnation of a long standing scam. They will take your personal ID information and either use it themselves or sell it to others to access your finances.

There is some information on this online, but it is buried and takes a little searching, but this is a fraud. DO NOT SEND THEM ANY PERSONAL INFORMATION.
Their address is; National Processing Center 325 Pennsylvania Avenue, Washington, DC.

Do not send personal ID information to anyone.

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