Yes, but... We are all prone to getting cataracts. They are a normal aging change in the eyes, causing our natural lenses to lose clarity. Some individuals may get cataracts at an earlier age due to exposure to certain chemicals or ultraviolet; others may have a family tendency toward early cataracts. There is currently no treatment to prevent cataracts, although a short procedure will permanently remove them.
To a small extent. Except for special cases like trauma and cataracts at birth, most cataracts fall along a bell shaped curve usually starting in the 40s with a peak in the 70s and some in the 90s still not getting a significant change. I don't think that people are "prone" to getting cataract but if you live long enough, you will probably get them.