20 CFR § 404.232
Computing your average monthly wage under the guaranteed alternative
February 18, 2021
(a) General. With the exception described in paragraph (b) of this section, we follow the rules in §404.221 to compute your average monthly wage.
(b) Exception. We do not use any year after the year you reach age 61 as a computation base year in computing your average monthly wage for purposes of the guaranteed alternative.