From http://fortune.com/2015/03/26/tim-cook/ http://fortune.com/2015/03/26/tim-cook/ : "He plans to give away all his wealth, after providing for the college ed

From http://fortune.com/2015/03/26/tim-cook/ http://fortune.com/2015/03/26/tim-cook/ : "He plans to give away all his wealth, after providing for the college education of his 10-year-old nephew." So presumably 12 when he said that.