(1) For the purposes of this Act -
(a) a person is deemed to be over any age mentioned in this Act where the person has attained that age and is deemed to be under any age mentioned in this Act where the person has not attained that age;
(b) a person is deemed to be between 2 ages mentioned in this Act where the person has attained the first-mentioned age but has not attained the second-mentioned age;
(c) a person is deemed not to have attained the age of 16 years until the beginning of the 16th anniversary of the day of the person's birth, and similarly with respect to any other age;
(d) regulations may provide that, for the purpose of determining whether a contribution is payable in respect of a person, or at what rate a contribution is payable, the person shall be treated as having attained at the beginning of a contribution week, or as not having attained until the end of a contribution week, any age which that person attains during the course of that week;
(e) the circumstances i
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