Alcohol Use by 50 Year Olds in the US
"Alcohol consumption is relatively high among 50-year-olds, with over two thirds (68%) indicating that they consumed at least one alcoholic drink in the prior 30 days, 11% reporting current daily drinking (defined as drinking on 20 or more occasions in the prior 30 days), and 19% indicating recent occasions of heavy drinking (defined as five or more drinks in a row on at least one occasion in the prior two weeks). The rate of recent occasions of heavy drinking is much lower than was exhibited by members of this cohort when they were of high school and college ages."
Johnston, L. D., O’Malley, P. M., Bachman, J. G., & Schulenberg, J. E. (2012). Monitoring the Future national survey results on drug use, 1975–2011: Volume II, College students and adults ages 19–50. Ann Arbor: Institute for Social Research, The University of Michigan, p. 35.