To qualify for an old age contributory pension a person must have entered insurance at least ten years before reaching pension age, have at least 156 contributions paid and have a yearly average of at least 20 contributions registered since January, 1953, when the unified system of social insurance came into effect, or the time of entering insurable employment if later.
Social insurance contributions paid before 1953 under the national health insurance Acts can be taken into account in satisfying the first two conditions but cannot be used in calculating the yearly average.
In this regard it is relevant to point out that prior to 1953 three different types of contributions were payable. These were —national health insurance, widow's and orphan's pensions and unemployment insurance contributions.