(1) The contribution conditions for old age (contributory) pension are -
(a) subject to subsection (2), that the claimant has entered into insurance before attaining the age of 56 years,
(b) that the claimant has qualifying contributions in respect of not less than 156 contribution weeks since his entry into insurance, and
(c) that the claimant has a yearly average or in the case of a person who attains pensionable age on or after the 6th day of April, 1992, an alternative yearly average of not less than 48.
(a) In the case of a person who attained the age of 57 years before the 1st day of July, 1974, subsection (1)(a) shall be construed as if "60" were substituted for "56".
(b) In the case of a person who attained the age of 57 years on or after the 1st day of July, 1974, subsection (1)(a) shall be construed as if "58" were substituted for "56".
(c) In the case of a person who attained the age of 56 years on or after the 1st day of April, 1975, subsection (1)(a) shall be cons