20s
American Academy of Dermatology; Group Health Cooperative Center for Health Studies; Washington State Department of Health; Journal of the American Medical Association; New England Journal of Medicine; Scarborough Research; Washington State Department of Licensing; University of Chicago National Opinion Research Center; Centers for Disease Control and Prevention; National Osteoporosis Foundation; Mayo Clinic; National Cancer Institute; University of Washington

30s
Washington State Department of Health; American Society for Reproductive Medicine; National Osteoporosis Foundation; AARP; Scarborough Research; Centers for Disease Control and Prevention; Group Health Cooperative Center for Health Studies

40s
American Academy of Dermatology; American Society for Aesthetic Plastic Surgery; Scarborough Research; The Merck Manual of Geriatrics; Washington State Department of Health; National Institute on Aging; National Cancer Institute; National Institutes of Health; AARP; U.S. Census Bureau; Mayo Clinic; National Women's Health Information Center; Group Health Cooperative Center for Health Studies; North American Menopause Society

50s
American Academy of Dermatology; Mayo Clinic; Harvard University; Centers for Disease Control; American Society for Reproductive Medicine; National Institute on Aging; Scarborough Research; AARP; National Cancer Institute; U.S. Consumer Product Safety Commission; American Academy of Orthopaedic Surgeons; Group Health Cooperative Center for Health Studies

60s
AARP; National Sleep Foundation; National Institute on Aging; National Council on Aging; Alzheimer's Association; Washington State Department of Health; Centers for Disease Control and Prevention; National Institutes of Health; U.S. Census Bureau; Washington State Aging and Disability Administration; American Academy of Ophthalmology

70s
The Merck Manual of Geriatrics; National Institutes of Health; Ohio Department of Health; National Institute on Aging; Tufts University Modified Food Pyramid for Older Adults; Washington State Department of Health; National Highway Traffic Safety Administration; Group Health Cooperative Center for Health Studies; National Center for Health Statistics; Centers for Disease Control and Prevention; Alzheimer's Disease Education and Referral Center

80s
Group Health Cooperative Center for Health Studies; National Library of Medicine; Ohio Department of Aging; National Institute on Aging; Alzheimer's Association; Washington State Department of Health; National Institute of Mental Health; Centers for Disease Control and Prevention; Washington State Department of Licensing; U.S. Census Bureau; British Medical Journal; CDC National Vital Statistics Reports