Doesn’t make sense at age 65 and spouse at 56 to move to Canada if I choose to or not a good idea? We are both US citizens . I would need to get dual citizenship if I wanted to retain my Social Security I assume?
"...to move to Canada if I choose to..." sounds very intriguing. I do not think so you would choose. There is a process to get there...
As far as SS - no worries, it's all yours, just read more for US/Canada treaty.
As far as whether it make sense depends on what your goal is. If you would like to save on cost of living - no way, it's about the same depending of location. Please give more details on your situation.
Regardless "it's most likely impossible".