Final answer:
In the United States, any individuals selling, serving, or handling alcohol must be at least 21 years of age, as stipulated by the National Minimum Drinking Age Act of 1984, which is enforced federally and reflects most state laws.
Step-by-step explanation:
The minimum age for individuals selling, serving, or handling alcohol typically aligns with the state's legal drinking age, which is influenced by the National Minimum Drinking Age Act of 1984. This act required states to set their minimum drinking age to twenty-one or risk losing a significant portion of federal highway funds. Although state-by-state enforcement may vary and some exceptions may exist for employment purposes, the general guideline across the United States is that any individuals selling, serving, or handling alcohol must be at least 21 years old to comply with federal law and most state regulations.