20 CFR §404.112

If you are age 55 or over on January 1, 1984, and are on that date an employee of an organization described in § 404.1025(a) which does not have in effect a waiver certificate under section 3121(k) of the Code on that date and whose employees are mandatorily covered as a result of section 102 of Pub. L. 98-21, we consider you to be fully insured if you meet the following requirements: