While the age of retirement has changed over the years it has changed the full age of retirement for people born during different years. Jack Myers with the Social Security Administration says that while the retirement ages have fluctuated, collecting benefits before or after your full retirement age has some stipulations.
While working after full retirement doesn't put a cap on earnings, there is an opportunity to collect before fully retired.
The limit pertains only to earned income, which includes gross wages or net earnings from self-employment. Myers explains the exact details for limit earnings and penalties incurred if money earned goes over the limit.
More information on collecting social security retirement benefits both before and after the full retirement age can be found at socialsecurity.gov.