Michael J. Fox reflects on Parkinson's and past choices.

Michael J. Fox speculated that he may have done "some damage" during the height of his fame that contributed to his Parkinson's disease diagnosis. He also said that he doesn't expect to live past 80 years old and that living with Parkinson's disease is getting harder. Fox believes that his diagnosis is likely a combination of genetic and environmental factors. Parkinson's disease is a neurodegenerative disorder that mostly affects the dopamine-producing neurons in the brain.