The presenter told Radio Times magazine that he "can't plan beyond 12 years" because the cancer has spread to the bone.
Sharing that he regarded his lack of doctors visits over the years with pride, he now admits that he's "cross" with himself for not paying a visit to the GP.
He hopes that by talking about his experiences, it'll help encourage other men to get tested for prostate cancer sooner, which is the most common form of cancer in United Kingdom men.
Prostate cancer now kills 10,900 men-a-year and Prostate Cancer UK warn that this number could surge to 15,000-a-year by 2026. I have got cancer. Here's what you need to know about the disease.
Prostate cancer is very common, and the causes are largely unknown.
How is prostate cancer treated?
"It is crucial for every man to acknowledge the threat that prostate cancer can pose to his life".
Only men have a prostate gland - which is the size and shape of a walnut and grows bigger with age.
In later diagnoses, if the cancer has spread to other parts of the body, typically the bones, it can not be cured.
In fact, these two conditions are more common than prostate cancer - but that doesn't mean the symptoms should be ignored.
The NHS website says for many, treatment is not immediately necessary: "If the cancer is at an early stage and not causing symptoms, a policy of "watchful waiting" or "active surveillance" may be adopted".
Symptoms that the cancer may have spread include bone and back pain, a loss of appetite, pain in the testicles and unexplained weight loss.
What else do men need to know? .
He said: "I am in good spirits and hope to be around for some time yet".
Bill Turnbull revealed he has prostate cancer.
How do doctors test for prostate cancer? . Your PSA can be high if you have prostate cancer, but it can also be higher than normal if there is infection, inflammation or a large prostate, explains Professor Hashim Ahmed, consultant urological surgeon at the Bupa Cromwell Hospital.
According to the NHS, the most commonly used tests are blood tests, a physical examination of your prostate (known as a digital rectal examination) and a biopsy.
There's also a familial link, so having a dad or brother who had prostate cancer increases your risk. Some foods are especially prostate-healthy, such as brassicas (cauliflower, broccoli), cooked tomatoes, green tea, mixed nuts and pomegranate juice. While there are lots of scare stories and misconceptions out there about cancer, there are most definitely things you can be doing to reduce your risk, highlights Professor Ahmed, many of which revolve around having a healthy lifestyle. These produce antioxidants that protect prostate tissue. Try to steer clear of passive smoke too.