The qualifications as to age prescribed by this chapter do not apply to a member of a fire department who makes an application for a pension on account of injuries or disabilities that result in the firefighter being unfit to perform the duties of an active firefighter. The relief association shall pay the pension to those members, or to the surviving spouse or children of a deceased firefighter, in the amounts and under the limitations and conditions as its articles of incorporation and bylaws provide and permit. A pension paid to any one family, however, may not exceed the maximum monthly service pension permitted under this chapter.