'Age' in the Bible

Thou shalt come to thy grave in a full age, like as a shock of corn cometh in in his season.

For inquire, I pray thee, of the former age, and prepare thyself to the search of their fathers:

And thine age shall be clearer than the noonday; thou shalt shine forth, thou shalt be as the morning.

Yea, whereto might the strength of their hands profit me, in whom old age was perished?