Lahey, J. (2005). Aging and the Labor Market. Cambridge, MA: Massachusetts Institute of Technology.

This study "involved sending 4000 resumes to firms in Boston, Massachusetts and St. Petersburg, Florida. These resumes were for job applicants between the ages of 35 and 62. Since most people do not actually put their ages on resumes, age was indicated by date of high school graduation...To avoid the issue of what employers value in a work history, the experiment only applied to entry-level jobs, or jobs that required up to a year of education and experience combined. These included positions such as clerical work, licensed practical nurse (LPN), air conditioner repair-person, and nail tech."

Note: Boston was chosen for a convenience sample and St. Petersburg for being a city which has a large concentration of an elderly demographic makeup to what the US Census projects the United States to have in 2020.