The 76-year-old funny man, who was diagnosed with Parkinson’s in 2012, reveals: “My Parkinson’s is not going to go away and it’s going to get worse. My life is slipping away. There is no denying it, I am 75, I have got Parkinson’s and I am at the wrong end of the telescope of life. I am at the point where the yesteryears mean more than the yesterdays. Because it is back there in my childhood and youth when I got to all those things that made me that live keenest in my memory now.”
Reflecting on life and mortality, Billy says later in the episode: “My life, it’s slipping away and I can feel it and I should.
“I’m 75, I’m near the end. I’m a damn sight nearer the end than I am the beginning, but it does’t frighten me.
“It’s an adventure and it is quite interesting to see myself slipping away,” he admits.
“As bits slip off and leave me, talents leave and attributes leave.”
Billy explains he doesn’t have the same balance or energy he used to and can’t hear or see as well as he once could.
“I can’t remember the way I used to remember. And they all came one at a time and they just slipped away, thank you,” he says.
“It is like somebody is in charge of you and they are saying, ‘Right, I added all these bits when you were a youth, now it’s time to subtract.’”
The comedian poignantly muses: “It is as if I am being prepared for something, some other adventure which is over the hill.
“I have got all his stuff to lose first and then I will be the shadowy side of the hill, doing the next episode in the spirit world.”
Billy, who was received a knighthood last year, was diagnosed with prostate cancer around the time he learned he was suffering from Parkinson’s.
He has since been given the all-clear after receiving treatment for the cancer.
The Big Yin previously opened up about how he first found out about his Parkinson’s in an interview with the Daily Mail.
“I was staying in a hotel in Los Angeles and had been coming in and out of the lobby,” he recalled. “There was an Australian dance team staying there and the guy in charge of them came over to me and said: ‘Billy, I’m a fan of yours and I’m a doctor.
“‘I’ve been watching you walking in and out of here and you have a strange faint. I think you have got early onset Parkinson’s disease, you need to go and see your doctor.’”
Billy explained how he had returned home and sought medical advice before the diagnosis was confirmed.
“I’ve learned to live with the disease,” he added.
Billy Connolly: Made In Scotland concludes Friday at 9pm on BBC Two.