In 2015, the Bureau of Labor (BLS) Statistics released the results of a study dubbed the "National Longitudinal Survey of Youth 1979." This survey observed the employment habits of nearly ten thousand men and women of various groups over a 30-year period. Of all the data presented by the study, two numbers most characterize the evolution of the American job market: 11.7 and 93.7.
The former represents the average number of jobs a person will work between the ages of 18 and 48; the latter the percent of people age 30 to 34 who will spend less than 15 years with any single employer.