How old do you have to be to bartend?

Each state governs its own alcohol laws.
Below is a list of states and the minimum age to bartend.
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State	Age to Bartend	State Agency	Training Requirement
Alaska	21	Alcoholic Beverage Control Board	Mandatory
Alabama	21	Alabama ABC Board	Voluntary
Arizona	19	Arizona Department of Liquor	Voluntary
Arkansas	21	Arkansas ABC	Server Book
California	21	California ABC
Colorado	18	Colorado ABC
Connecticut	18	Connecticut Liquor Control
Delaware	21	Delaware ABC
Florida	18	TIPS Florida
Georgia	18
Hawaii	18	Hawaii Liquor Control
Idaho	19	Idaho ABC
Illinois	21	Illinois Liquor Control Commision
Indiana	21	Indiana Alcohol & Tobacco Commission
Iowa	18	Iowa ABD
Kansas	21
Kentucky	21	Kentucky ABC
Louisiana	18	Louisiana Alcohol Control
Maine	18	Maine ABC
Maryland	21	Maryland ABC
Massachusetts	18	Massachusetts ABC
Michigan	18	Michigan Liquor Control (PDF)
Minnesota	18	Minnesota-AST	Trainer List
Mississippi	21	Mississippi ABC
Missouri	21	Missouri Alcohol Control
Montana	18	Montana Department of Revenue
Nebraska	18	Nebraska Liquor Control
Nevada	21	Nevada ABC
New Hampshire	18	New Hampshire Liquor Commission
New Jersey	18	New Jersey ABC
New Mexico	21	New Mexico
New York	18	New York Liquor Authority
North Carolina	21	North Carolina RASP
North Dakota	19	North Dakota ABC
Ohio	21	Ohio ASK
Oklahoma	21	Oklahoma
Oregon	21	Oregon Liquor Control
Pennsylvania	18	Pennsylvania RAMP
Rhode Island	18	Rhode Island
South Carolina	21
South Dakota	21
Tennessee	18	Tennessee ABC
Texas	18	Texas TABC
Utah	21	Utah ABC	Mandatory
Vermont	18	Vermont Liquor Control
Virginia	21	Virginia RSVP
Washington	21	Washington MAST
West Virginia	18
Wisconsin	18	Wisconsin DOR
Wyoming	21	Wyoming ABC

Every state has its own bartending age.

The age to bartend is at least 18, but might be 19 or 21 years old.