Our aching heads.
Just about everyone takes drugstore pain remedies.  The fastest growth in this market could be for heart-attack prevention, but millions of Americans will also combat headaches, arthritis, and a host of other ailments, generating modest growth in the number of users into the next century.
Dortch
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D000700:Analgesics / Q000627:therapeutic use; D004363:Drug Utilization / Q000706:statistics & numerical data / Q000639:trends*; D005544:Forecasting; D006261:Headache / Q000188:drug therapy; D006801:Humans; D014481:United States
D000700:Analgesics