Over a dozen of the top 35 richest people in the world — according to Forbes real-time data — have children under the age of 40. Many of these children are poised to inherit billions from their superrich parents, while others will receive smaller cuts due to their parents signing the Giving Pledge. From Facebook founder Mark Zuckerberg's toddlers to Bernard Arnault's LVMH executive sons, here's a closer look at some of the world's wealthiest heirs and heiresses. Visit BusinessInsider.com for more stories.