What does the gray spot on the eyeball is. What causes to get it ?

answered:

Gray eye spot

Sclera
The most common cause of a gray eye spot as we age is senile scleral plaques. They are benign and do not cause any problems.
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Eye Gray Plaque Sclera

answered:

Depends

Eyes
If the gray spot is on the white of the eye about half way from the colored part (iris) to the inner corner, it could just be thinning of the white part (sclera) due to age. It is not serious and wil not cause any problem. To answer your question better, I really need to know exactly where the gray spot is.
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Eye Iris Gray Sclera