Here is a list of other causes of cataracts besides advancing:
No one knows for sure why the eye's lens changes as we age, forming cataracts.
But researchers worldwide have identified factors that may cause cataracts or are associated with cataract development.
Besides advancing age, cataract risk factors include:
(edited list for pets)
Diabetes / hypertension
hereditary
hypertension / excessive sodium in the diet
Obesity
Previous eye injury or inflammation
Ultraviolet radiation from sunlight and other sources
2nd hand smoke