If you want to focus the crossroads where demographic trends meet marketing, you can subscribe to American Demographics magazine, among others. Medicare recipients are not in good health, compared to about a quarter of whites, according to the Kaiser report. Meanwhile, two-thirds of white beneficiaries currently have some form of insurance or retirement benefits to supplement Medicare, compared to only a third of black beneficiaries and a quarter of Latinos. Medicare's costs could rise disastrously and threaten the federal budget with renewed deficits if it must fund the treatment of a rapidly growing number of elderly who have received inadequate healthcare most of their lives and still lack funds for any optional or preventative treatments. There are thousands of local and regional demographics sources, from universities to private companies.
Many state departments offer detailed information.
If you get tired of wading through the web to isolate the specific information you want, you can always pay a private demographics firm to prepare it for you. Most start with the US Census data and use their own statistical algorithms to update data annually. The competition created by the web has pushed prices down considerably in the past few years. If you want general information, you may be able to find it in a few minutes. The more specialized your needs, the more hours you will want to allocate.