N.J. Stat. § 43:4-3
A person so retired shall be entitled, for and during his natural life, to receive by way of pension, one-half of the compensation then being received by him for his service, which shall be paid in the same way and in the same installments as his compensation has been payable. No pension paid under this article shall be less than fifty dollars per month, unless the person so retired shall at the time of his retirement be receiving compensation of less than fifty dollars per month, in which case he shall be paid on retirement the full amount then being received by him for his service.
In case of retirement with pension from office or position under any other law of this state, the person retiring shall waive either his pension under that law or his pension under this article.
N.J.S. § 43:4-3