The legal age to work at a bar varies by state, with some requiring employees to be at least 18 or 19 years old, while others mandate a minimum age of 21. Additionally, certain roles within bars, like bartending, may have their own age requirements, regardless of the legal age to serve alcohol in a specific state. Furthermore, obtaining a license to sell or serve alcohol may also have its own age requirements, which can vary by location. To determine the specific age requirements for working at a bar, it is best to consult local laws and inquire with the establishment where you are seeking employment.