A 19-year-old can legally serve alcoholic beverages in a restaurant when he turns 21.
This refers to the legal declaration about when a person can legally serve alcohol.
We can note that this legal age varies according to different locations, but in the United States, the age is 21 years old, except for special cases when a person between 18 and 21 can serve if he is a bonafide employee in a public eating place.
Read more about alcohol laws here:
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