The 2025 list of youngest billionaires reveals heirs shaping global wealth. Topping it is 19-year-old Johannes von Baumbach, worth $5.6 billion via pharma giant Boehringer Ingelheim. Others include Brazil's Lívia Voigt (20), eyewear heir Clemente Del Vecchio (20), and Nexon heiress Kim Jung-youn (21), highlighting the growing influence of inherited wealth over self-made fortunes.