I saw a study today from the NDP Group about children and technology. It said that:
On average, children begin using electronic devices at approximately 7 years of age with televisions and desktop computers showing the youngest initial exposure (about 4 or 5 years of age), and satellite radios and portable digital media players (PDMP) showing the oldest (about 9 years of age).
‘Round here, we start ’em young. Here’s a video of Hayden when he was six months (ie, during the silent film era):