Depends on where you live. Sometimes it's 18, sometimes it's 21. I know they have things like internships where you can be under 18 and just learn how things work.
Added: The above may be only partially correct -- with these observations: (in the US) There are FEW, if any, jurisdictions which will grant you full powers as a law enforcement officer prior to your 21st birthday. However there might be some which may employ you in a non-sworn position (clerical - communications - administrative), and still others which may even offer you a position as a jailer or turnkey. You will have to contact the agency you are interested in and ask.
The answer depends on the type of officer: military? police? corporate?
How old do you have to be to become a police officer? Generally, towns begin hiring around the age of 21, or that is when you can submit an application.
i heard you have to be 18 to be a police officer in the state of arkansas, but you have to be 21 to be a state trooper.source: my cousin got pulled over and started talking to the cop about him wanting to be a future police officer.
Most states require you to be 18 years old to begin training.
Certainly a police officer can question a 7 year old.
It's possible, but unlikely. In any event, you would have to demonstrate many intervening years of lawful conduct before you would be eligible to be a police officer.
You need to be 18 years of age but some academies wont accept you till you're 21
Never in life.
I'll answer this by repeating an old police adage - - "Fishermen can't catch all the fish in the lake either."