Fink turns 72 in November, and the company has said it is prioritizing finding successors to him and Rob Kapito, the president and another cofounder. It's been an exercise in assessing Fink's best-loved kids. In interviews, insiders have consistently named the same two senior executives as most likely to replace Fink: Mark Wiedman, 52, the head of the global client business, whom people describe as most like Fink, and the 50-year-old chief operating officer, Rob Goldstein.