I'm sure she's had a little experience, but the touch interface is really intuitive. My daughter was less than a year old when we watched her unlock my wife's

I'm sure she's had a little experience, but the touch interface is really intuitive. My daughter was less than a year old when we watched her unlock my wife's iPhone and start playing with it. It wasn't taught to her, it was just natural "mommy did this, then this, so I will too and it works".