A. Allowance payable on retirement. - Upon retirement for disability, a member who has five or more years of creditable service shall receive an annual retirement allowance during his lifetime and continued disability equal to 1.70 percent of his average final compensation multiplied by the smaller of (i) twice the amount of his creditable service or (ii) the amount of creditable service he would have completed at age 60 if he had remained in service to that age. Notwithstanding the foregoing, for a member who (a) is a person who becomes a member on or after July 1, 2010, or (b) does not have at least 60 months of creditable service as of January 1, 2013, the allowance shall equal 1.65 percent of his average final compensation multiplied by the smaller of (1) twice the amount of his creditable service or (2) the amount of creditable service he would have completed at age 60 if he had remained in service to that age. If a member has already attained age 60, the amount of creditable service at his date of retirement shall be used. For retirements between October 1, 1994, and December 31, 1998, any employee or local officer who is a member or beneficiary of a retirement system administered by the Board shall receive an additional retirement allowance equal to three percent of the disability retirement allowance payable under this section; provided that, for purposes of this additional retirement allowance, the term employee shall include only those employees of political subdivisions that have adopted a resolution providing for such an allowance under subsection B of § 51.1-130. Average final compensation attributable to service as Governor, Lieutenant Governor, Attorney General, or member of the General Assembly shall not be included in computing this additional retirement allowance.