Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Alcohol Use and Older Adults ?
    ### Response:
    Blood alcohol concentration (BAC) measures the percentage of ethanolthe chemical name for alcohol in alcoholic beveragesin a persons blood. As you drink, you increase your blood alcohol concentration (BAC) level. The higher the BAC, the more impaired a person is.
    