The composition of the U.S. workforce is changing. The Bureau of Labor Statistics projects that by 2014 workers who are aged 55 and older will comprise 21.2% of the labor force--compared to 15.6% in 2004 and 11.9% in 1994. More corporations are beginning to pay attention to this trend and have begun to assess the needs and potential of older workers. In 2007, The Council for Adult and Experiential Learning (CAEL) conducted research on corporate approaches to the mature workforce. The companies CAEL examined for this study--Blue Cross Blue Shield of Illinois (BCBSIL), Main Line Health System (MLH), and IBM--have begun to recognize the potential business opportunity in helping their older workers, and they are therefore making an investment in training these employees, envisioning new roles for them, and developing innovative strategies for knowledge transfer. This brief documents the mature-worker strategies developed by these three leaders, the business needs that led to the change, the business value of those investments, and the impact of the initiatives on company practices more generally. (Contains 7 footnotes.) [Funding for this report was provided by The Conference Board.]