1. Commencing with the fourth year after the effective date of the ordinance codified in this chapter, the normal and dependent rates of contribution of each member, as actuarially recommended and approved by the retirement board, shall be based on his age at July 1, 1937, or at his later entrance into the retirement system, and his age when he became or shall become a member of the fire department, both ages being taken to the next lower completed quarter year.

2. The age at entrance prior to July 1, 1937, shall be determined by deducting the total service in the department credited to the member at July 1, 1937, from his age at that date.

3. The age at entrance after July 1, 1937, into the department, shall be the same as the age of entrance into the retirement system.

4. The rates so adopted shall remain in full force and effect until revised as provided in Section 2.92.090. (Prior code § 5.38.110(a,b))