To estimate the number of frequent bar-goers in the US, we can start with the total population and apply several filters. First, consider the US population of approximately 330 million. We need to exclude individuals under the legal drinking age of 21. Let's also make an assumption that individuals over 60 are less likely to be frequent bar patrons due to lifestyle changes or preferences for other social settings. This leaves a core demographic, roughly between 21 and 60 years old. If we divide the population into age groups, say 20-year increments, we can estimate the size of this core group. For instance, if we consider the 20-40 and 40-60 age brackets, each containing roughly 40 million people, we have about 80 million potential bar-goers. From this group, we need to estimate the percentage who are 'frequent' visitors, defined as going to a bar at least twice a week. This is a smaller subset, perhaps around 10-15% of the 21-60 age group, considering work schedules, social habits, and economic factors. This would place the estimate in the range of 8 to 12 million frequent bar-goers in the US.