Preview: Michael J. Fox on Parkinson's, and optimism

Actor Michael J. Fox was diagnosed with early-onset Parkinson's disease in 1991 when he was just 29. In an interview with "CBS Sunday Morning" anchor Jane Pauley, Fox, now 61, says dealing with the incurable disease is getting more challenging, and he can't imagine living until he's 80.

The revealing and emotional interview will be broadcast on "CBS Sunday Morning" April 30 and streamed on Paramount+.

In a wide-ranging conversation, Fox talks with Pauley about his life today; the recent breakthrough in research announced by his foundation identifying a genetic biomarker that could lead to earlier diagnosis; and how, with gratitude, optimism is sustainable.