I heard about senile cataract from my eye doctor. I'm only 58, so what is he talking about?

Cataract. This simply put is cataract formation related to the process of getting older.
Cataract. Cataract is a clouding of the natural lens in the eye. Senile refers to the aging process. Almost all cataract formation is due to the normal aging process. This does not mean you are old or senile, it just means the lens in your eye is turning cloudy over time, which is normal for every human being given enough time.