Back in 1995, the Bureau of Labor Statistics found that only 11.7% of employees 65 years and older held some sort of employment. Today, that percentage has gone up to 17.7%. This development has appeared as a result of a baby boomer generation that wants to maintain some sort of work and employers who want to keep these more experienced people around. This statistic could also be the result of an older generation that fears the United States is financially unstable. According to a Wells Fargo survey, 34% of people working over the age of 60 said that they plan to work until they are too sick or die.
See "Older Workers Seeking Options for Reducing Hours on the Job", November 23, 2015