Have any past presidents declined secret service protection?
Yes....President Nixon declined coverage.
Did any ex presidents declined secret service protection?
Usually 56 per retired president. But due to the incresed threat Pres. Bush has 103 at all the time.
How long do past presidents families receive secret service protection?
Until they die or refuse it. Also, their spouse is protected.
What president's have declined secret service protection after leaving office?
How many ex-presidents have secret service protection?
Sorry, that would be a 'secret'.