The number fifty is a symbol of the period in a person's life in which, by doing the Will of God, His Commandments, he completes his liberation from complete dependence on sin.

 "The number fifty" contains five times the number "Ten", i.e., figuratively means the five stages of knowledge and fulfillment of the Truth set forth in the Five Books of Moses by people who confess the Ten Commandments of God.    

Negative Meaning:

The number fifty is symbolic of the expression of the violation of the Ten Commandments, the Revelations of God's Will as set forth in the Five Books of Moses.