Today, there are nearly 52.4 million people age 60 or older in the United States, and by 2030, one in every five Americans will be age 60 or older. Many of them may be retired, but that doesn't mean that America's retirees are no longer working. More than 23 percent of people older than age 65 engage in volunteer activity. As the country's senior class continues to grow, baby boomers will play an even larger role in giving back to their communities. From mentoring children in need to keeping the country's parks and monuments up and running, volunteer opportunities for retirees abound [sources: Bureau of Labor Statistics, U.S. Census Bureau].
Here are a few of the most interesting and rewarding opportunities for retirees.