Billy Connolly, who today celebrates his 79th birthday, has been making us all laugh for more than 50 years.Although the star retired from touring in 2018, he has continued to appear on our screens and has also spoken candidly about his health in recent years.Billy was diagnosed with Parkinson's disease in 2013, and since his diagnosis, he has spoken openly about living with the disease in television interviews, telling The Guardian "It can be a very cruel disease."When asked on BBC's The One Show, what is it like living with Parkinson's, he said: "It has its moments."It's like just now, my left hand is shaking.