Also born in 1960 - may have to have a serious word with my parents why they picked that year
However, in the Bogleheads discussion, one can also find the following quote:
"The National Average Salary (or the National Average Wage) is the mean salary for the working population of a nation. It is calculated by summing all the annual salaries of all persons in work and dividing the total by the number of workers."
(Boldface by me). If that is the case, there may be at least some hope if the unemployed are not counted in the number of workers, at least for the time during which they were without work. This would be the reasonable way to count such an average - but of course you can't count on "reasonable" for anything coming out of Washington... But if the average is indeed calculated in this "reasonable" way, the situation may not be quite so dire, since those that didn't lose jobs may not have seen their salaries drop much on average, so the effect would be much smaller.
It seems we would need to have somebody study the details of the law or the SS regulation; I am not quite sure where to look myself, but perhaps others here have an idea?