I've had geographic tongue for over a year, will it stay the rest of my life?

Probably: Depending on the cause, ie medications, undiagnosed diseases, you will probably have it long term unless the underlying cause is determined and treatment instituted.

Probably: Nobody knows the actual cause of the condition but there is also no official cure. For most people this condition does not pose any concern. Make sure that a medical or dental professional confirms this diagnosis.