AARP — Political position papers, member discounts, demographic research, online versions of its bulletin, and magazine and consumer advice.

Center for Medicare Advocacy — Detailed information about what Medicare covers, and how to enroll and, if necessary, appeal denial of claims. — An all-purpose site with interactive tools for planning and paying for long-term care and choosing among drug plans. Includes searchable inspection results, good and bad, for the all the nation’s skilled nursing facilities. — A collaboration of the National Institutes of Health and the National Library of Medicine that provides authoritative information on all diseases and disorders of old age. Each section is available in both large-type and audio versions.

National Institute on Aging — Describes ongoing research on aging and lists clinical trials seeking participants.

U.S. Administration on Aging — Brief fact sheets on aging and links to outside resources for an assortment of caregiving issues, including financial planning, residential options, in-home services, case management and the law. A tool to help determine benefit eligibility for a variety of government programs.

Family Caregiver Alliance — Offers tips on a wide range of topics, including how to hire help, hold a family meeting, balance work and caregiving, find important papers, and decide whether parents should move in with an adult child.

National Alliance for Caregiving — Reviews of more than 1,000 books, videos, Web sites and links.

National Family Caregivers Association — Provides statistics, research and policy reports, tip sheets, first-person accounts, a newsletter and an exhaustive resource list.

Family Caregiving 101 — A separate “how-to” site by the NFCA with advice on time management, asking for help, navigating the health care maze and communicating with insurance companies and hospitals.

Children of Aging Parents — Support groups, both online and face-to-face. Newsletter focuses on interpersonal matters like stress among siblings, caregiver depression and getting through the holidays.