The American Association of Retired Persons website provides a wide variety of resources to older adults who are over the age of 50. It is worth it to look around a bit and become familiar with the site. Lots of goodies hidden behind some of the links.
The Merck Manual Of Geriatrics provides information on working with older populations, disease prevention, Federal health care funding, issues related to provision of care, quality of life and social issues in older adults.
This is a link to the electronic version of the Journal of Gerontological Social Work by year, issue and then table of contents. It is appropriate to use this as a means to find articles relevant to your topic. However, using a database, such as Abstracts in Social Gerontology [on the previous page] and searching by subject and/or keyword will results in a more efficient set of results.
Special supplement to the journal Families in Society on the aging population and poverty.
Click here for the fulltext: http://www.familiesinsociety.org/new/SpecialIssue/AgingInPoverty/AgingInPoverty.pdf
The Evidence Database on Aging Care site was "created... to help scholars, policy analysts, and advocates stay on top of the latest research and innovations in aging care, including health care and social services".