In the same CNBC interview, Jack Bogle stated that not all of his children were interested in investing, and only one of his six children became a hedge fund manager some years later. For those children who are less interested in learning about investing, Bogle feels we should find a way to communicate with them about investing, depending on their level of interest. For his grandchildren, who range in age from their late teens to early twenties, Bogle briefly discusses the performance of the investments in their individual portfolios at the end of each year.