Is this a fire sprinkler if so how old?

[Unitedstatesofamerica1]

 

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[releventchair]

Gas valve.
Maybe off an appliance.

 

[Doubter in MD]

Gas valve.
Maybe off an appliance.

Yes. Definitely a gas valve. Age is hard to say.

 

[weighit]

Looks like a gas valve off an old lamp to me

 

[Tony in SC]

It's called a "cock". Used as a gas valve but also many other uses as well. Fuel shut off on tractors, water hopper drain on hit&miss engines and more. Usually the ones for gas had an "L" shaped handle.