Teachers who were inactive in their profession on April 23, 1945, who, prior to that date, taught in the public schools of this State for 25 years or more and are no longer capable of teaching, and teachers who were inactive in their profession on April 23, 1945, who, prior to that date, taught in the public schools of this State for 15 years or more and who attain the age of 65, shall be entitled to receive a pension out of the fund continued by § 3901 of this title for the duration of their respective lives. The amount of such pension shall be determined by the number of years of teaching service, as follows:
| 15 years of service, $185 per month; | |
| 16 to 20 years of service, $190 per month; | |
| 21 to 25 years of service, $200 per month; | |
| 26 or more years of service, $210 per month. |