6. If the lessee or the lessee’s spouse is 60 years of age or older and if the lessee so requests, the monthly rent is established according to the lowest of(1) the maximum rent established in accordance with Schedule I;
(2) the rent established in accordance with section 5; and
(3) a rent of $100, plus 2% of the income in excess of the first $20,000 of income resulting from the application of the formula [A - (B + C)] having the parameters defined in section 5; despite section 2, the rent may be lower than the minimum rent established in accordance with Schedule II.