Health care providers and large companies once again dominated AARP's annual list of Best Employers for Workers Over 50. But non-profit organizations are also starting to adopt the kind of flexible scheduling and benefit programs that work in the private sector.

The YMCA of Greater Rochester (N.Y.), for example, ranked 13th on this year's AARP list. The Rochester Y, also a winner of a BreakThrough award from Civic Ventures and the MetLife Foundation, offers job sharing, part-time positions and flexible schedules to recruit older adults to better match its membership base. The older employees have proven to be more reliable and more likely to complete assignments, and the turnover rate for those 50 and older is just 2 percent, compared to 20 percent overall.

Centers for New Horizons, a child and community development organization in the Bronzeville neighborhood on the south side of Chicago, also made the list. In addition to educating 20,000 young children, the Centers has helped generate $500 million in capital investment in the community and spun off a dozen nonprofits to expand opportunities for local residents, according to the organization's website.

The final spot on the list went to the Girl Scouts of Nassau County (N.J.).

SC Johnson, the Racine, Wisc., consumer goods company, topped the list. The company provides an on-site medical center, various wellness, fitness and recreation programs and an on-site education program that offers lifelong learning and college credits; and paid sabbaticals to experienced employees.

Alternative work arrangements at not-for-profit Mercy Health System of Janesville, WI, let nurses "float" between different facilities or departments), and allow employees to maintain benefits while on leave.

"Focusing on the employee's personal needs pays dividends," said Bill Novelli, AARP's chief executive. "It is important that more employers - both large and small - recognize what tremendous assets 50 and over employees represent because of their experience and motivation."

Here's the full list:

1. SC Johnson (Racine, WI)
2. Mercy Health System (Janesville, WI)
3. First Horizon National Corporation (Memphis, TN)
4. Scripps Health (San Diego, CA)
5. Stanley Consultants (Muscatine, IA)
6. Lee Memorial Health System (Fort Myers, FL)
7. Leesburg Regional Medical Center & The Villages Regional Hospital (Leesburg, FL)
8. George Mason University (Fairfax, VA)
9. Principal Financial Group (Des Moines, IA)
10. Massachusetts General Hospital (Boston, MA)
11. MidMichigan Health (Midland, MI)
12. Bon Secours Richmond Health System (Richmond, VA)
13. The YMCA of Greater Rochester (Rochester, NY)
14. Brevard Public Schools (Viera, FL)
15. Atlantic Health (Morristown, NJ)
16. ACUITY (Sheboygan, WI)
17. Volkswagen of America, Inc. (Auburn Hills, MI)
18. Saint Vincent Health System (Erie, PA)
19. Trinitas Hospital (Elizabeth, NJ)
20. Securian (St. Paul, MN)
21. Argonne National Laboratory (Argonne, IL)
22. Pinnacle Health System (Harrisburg, PA)
23. The Aerospace Corporation (El Segundo, CA)
24. Cornell University (Ithaca, NY)
25. Pinnacol Assurance (Denver, CO)
26. Jennings Center for Older Adults (Garfield Heights, OH)
27. John Deere (Moline, IL)
28. Bon Secours St. Francis Health System (Greenville, SC)
29. Centegra Health System (Crystal Lake, IL)
30. Virginia Commonwealth University (Richmond, VA)
31. Durham Regional Hospital (Durham, NC)
32. Rush-Copley Medical Center (Aurora, IL)
33. Monongalia General Hospital (Morgantown, WV)
34. Saint Barnabas Health Care Organization (West Orange, NJ)
35. Express Personnel Services (Oklahoma City, OK)
36. Ochsner Health System (New Orleans, LA)
37. Intuitive Research and Technology Corporation (Huntsville, AL)
38. Hospice of Marion County & Affiliated Companies (Ocala, FL)
39. West Virginia University Hospitals (Morgantown, WV)
40. University of Texas M. D. Anderson Cancer Center (Houston, TX)
41. Scottsdale Healthcare (Scottsdale, AZ)
42. Vanguard (Valley Forge, PA)
43. Fairfield Medical Center (Lancaster, OH)
44. Michelin North America (Greenville, SC)
45. St. John Health (Warren, MI)
46. Blue Cross Blue Shield Association (Chicago, IL)
47. Noblis, Inc. (formerly Mitretek Systems) (Falls Church, VA)
48. Frankford Candy & Chocolate Co. (Philadelphia, PA)
49. Centers for New Horizons (Chicago, IL)
50. Girl Scouts of Nassau County (Garden City, NY)