why do men after 50yr old are more in danger to have prostate cancer or swellings even testosteron is lower?

Answer 1

As we age, our cells divide less. With less cell division, this actually decreases the risk of cancer because there is less chance of "bad" DNA being incorporated. But, of course, this means our cells live longer and have to do more - so they age as well.

As we age, our immune systems grow weaker, partly for the above reason. And as such, we do become more susceptible to cancer overall as it becomes more difficult for our bodies to fight off the disease.

In other words, as we age, all people become more likely to have cancer or other age-related diseases. That is, the pneumonia we were able to fight off at 30 might lead to our deaths at 70 or older.

Prostate cancer is especially possible in men for that reason. Most men will see some enlargement in their prostate, increasing the need to urinate. This is normal. However, sometimes this enlargement is due to prostate cancer. The prostate is not involved in testosterone production, but it is involved in the production of dihydrotestosterone (DHT), a metabolite of testosterone. So decreased testosterone levels aren't necessarily a factor in whether a man gets prostate cancer.

I provided a wikipedia link that discusses some aspects of prostate cancer.

Answer 2

Its something all men when you reach this age you run the risk of this cancer developing. Its just a part of growing old so you should have this checked with your doctor.