The workforce in the United States is becoming "gray." The ratio of workers of age 50 or older among the whole working population will be 1 to 4 by the year 2030 (U.S. Census Bureau, 2010). Furthermore, the percentage of the U.S. workforce between the ages of 55 and 64 is growing faster than that for any other age group (Strack, Baier, & Fahlander, 2008). With the trend of the graying workforce, sustaining productive employment and enhancing job satisfaction among older workers is beneficial to them, their families, businesses, and society. Businesses have identified the benefits of retaining older workers, including more work experience, higher employee morale, and lower turnover rate than other age cohorts (Ritter, 2012). Maintaining productive employment past age 50 is also associated with improved overall health and maintenance of social and community participation (Christ et al., 2007). Finally, optimizing opportunities for older workers to maintain workplace productivity reduces the likelihood of their seeking long-term disability benefits (Loy, n.d.). However, the chance of acquiring functional limitations increases dramatically as one ages. For example, older age is associated with a higher prevalence of sensory or cognitive impairments (