Michael J Fox doesn't "think about his legacy" because it's "other people's business".
The 64-year-old actor - who is best known for playing Marty McFly in the Back To The Future trilogy, as well as roles in Family Ties and Spin City - insisted he doesn't worry about how people will remember him when he's done.
He told the Los Angeles Times newspaper: "I'll be dead.
"My late father-in-law wrote a book once called Die Broke. The theory being spend all your money now.
"I don't mean just money. Your gift, your nectar. Spend it all now, and spend it on your kids, on people you love. I don't think about legacy."
Michael was diagnosed with Parkinson's disease in 1991, and has since established his Michael J. Fox Foundation - which is dedicated to finding a cure for the illness and has gone on to fund $2 billion worth of research - and knows that work will "continue" once he's passed.
He added: "Certainly, the foundation will be around and our work will continue.
"It'd be nice to have it done before I die, but I don't know if that will happen. We're certainly getting closer.
"Legacy is other people's business; my business is to live my best life, do the best I can, the best work I can, seize opportunities like working with Billy and Harrison and continue to write my story until the pin drops."
Michael reunited with Spin City co-creator Bill Lawrence in the latest third season of Apple TV+ comedy Shrinking, which also stars Jason Segal, Jessica Williams and Harrison Ford.
The Star Wars legend's character Dr. Paul Rhodes is a therapist also struggling with Parkinson's.
Michael said: "It's so human and it was accessible for me. [I called and said] 'Bill, [how the f***] am I not on the show?' "
He previously explained how he tries to keep his sense of humour "intact" amid his battle with Parkinson's, which causes uncontrollable movements, such as shaking, stiffness, and difficulty with balance and coordination.
He told PEOPLE magazine: "It's hard for me. But I gotta keep it intact."
