Subject to this Act, a person shall be entitled to State pension (non-contributory) where -
(a) the person has attained pensionable age,
(b) the means of the person as calculated in accordance with the Rules contained in Part 3 of Schedule 3 do not exceed the appropriate highest amount of means at which pension may be paid to that person in accordance with section 156, and
(c) the person is habitually resident in the State.