At how old can a baby start to use a computer and understand an mouse or rosetta stone?

Question

Answer

Touch screen is much easier than a mouse. Age 2.

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My two and a half year old will play with my computer at work but she isn’t good at it yet. There are apps you can use though. She’s great on the iPad or phone. We do puzzles and educational apps and they have helped her learn and it helped give her some quiet time while I was nursing my son.

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Infants are learning sign language so I'm sure very early if you are persistent on teaching.

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My brother used to play on the computer when he was about 2. 
He understood mouse and keyboard control. But obviously couldn't read/write thus couldn't type a sentence. He's now a pro-gamer.

At how old can a baby start to use a computer and understand an mouse or rosetta stone?

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