A cataract is changes in the natural lens
inside your eye. It becomes cloudy and "harder" due to a lifetime of exposure to UV light and do to continued growth. It is a natural process in the vast majority of cases.
Once a cataract is removed it never comes back. After the surgery, however, the "bag" left inside your eye to hold the artificial lens may become cloudy (some people wrongly say this is the cataract coming back). This can be treated with a simple laser treatment in the office....and, it too, almost never comes back after laser treatment.
As I said, even if you live to be 110 after removal of your cataract it will not come back.
Does this make sense to you?
Here is a picture of the eye. You can see the lens behind the pupil. This is what gets cloudy and then is called a cataract. It is removed during surgery and a thin bag (like a ziplock bag) is left behind and an artificial lens put in its place.