Gibson was diagnosed with Parkinson's disease at the age of 18. It is rare for someone to be diagnosed with Parkinson's at such a young age. Gibson livedin denial about his condition for six years. He then pitched a documentary proposal to Channel 4, who commissioned him to make a documentary following Michael's journey with Parkinson's. All shook up: Parkinson's at 25 aired on Channel 4 in 2006.