23.0.1. Health insurance cards issued to insured persons referred to in subparagraph 5.1 of the first paragraph of section 23 shall be valid for not less than 27 months and not more than 75 months. The period of validity shall be computed from the expiry month and year indicated on the insured person’s current health insurance card to the month and year in which the insured person’s age becomes a multiple of 4.