(d) For tax years beginning on and after October 1, 1981, for residents of this state, over 65 years of age who have an annual adjusted gross income of less than $12,000 as reflected on the most recent state income tax return or some other appropriate evidence, or who are retired due to permanent and total disability, regardless of age, or who are blind as defined in Section 1-1-3, regardless of age or whether such person is retired, homesteads, as defined in the Constitution and laws of Alabama, are exempt from ad valorem property taxes levied by any county of this state, including such taxes levied for school districts. In no case shall the exemption exceed $5,000 in assessed value or 160 acres in area. With respect to homesteads situated in more than one county, the exemption shall be prorated between the counties in which the homestead is situated in the proportion that the area of the homestead in each county bears to the total area of the homestead claimed for exemption. The Department of Revenue, by rule, may define and specify the condition or state of health that makes a person "permanently and totally disabled" and may issue certificates of disability to any person that meets such specifications. Any person who is drawing any pension or annuity from the armed services, a private company, or any governmental agency because he or she is permanently and totally disabled shall automatically be granted a certificate of permanent and total disability by the Department of Revenue.