Michael J. Fox is opening up about his battle with Parkinson’s disease and his mortality.

The Back to the Future actor, 64, was diagnosed with early on-set Parkinson’s in 1991, at age 29, and has lived with the health condition for over 30 years.

According to the Michael J. Fox Foundation for Parkinson’s Research, which the actor founded in 2000, Parkinson’s occurs when “brain cells that make dopamine, a chemical that coordinates movement, stop working or die,” and can cause issues such as tremors, stiffness and walking and balance problems. It can also lead to depression, memory issues and other symptoms.

“There’s no timeline, there’s no series of stages that you go through — not in the same way that you would, say, with prostate cancer,” Fox said of his future prognosis in an intervie

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