Because you reached your retirement age, no matter how much you earn from work, it has no effect on your social security. In other words, there is NO limit to how much you can make.
Below is the direct quotation from the Social Security Website and publication. The link is also enclosed.
"If you were born January 2, 1943, through January 1, 1955, then your full retirement age for retirement insurance benefits is 66.
If you work, and are full retirement age or older, you may keep all of your benefits, no matter how much you earn."
Fiona Chen, MPA, Ph.D., CPA, ABV, CFF, CITP