Mark Zuckerberg debuted on the list of the world’s billionaires in 2008. He was 23 years old. By 2009, he was off the list due to a drop in Facebook’s valuation. The following year he was back in the billionaire’s club and he’s never looked back Below is a list of 25 of the richest billionaires in the world and how long it took them to make the leap from millionaire to billionaire. Sheldon Adelson Age he made first million: 27 Age he made first billion: 68 Years in between: 41 Warren Buffett Age he made first million: 30 Age he made first billion: 56 Years in between: 26 Carlos Slim Age he made first million: 25 Age he made first billion: 51 Years in between: 26 Bernard Arnault Age he made first million: 27 Age he made first billion: 48 Years in between: 21 Michael Bloomberg Age he made first million: 31 Age he made first billion: 52 Years in between: 21 Amancio Ortega Age he made first million: 49 Age he made first billion: 65 Years in between: 16 Robson Walton Age he made first million: 34 Age he made first billion: 48 Years in between: 14 Li-Ka Shing Age he made first million: 30 Age he made first billion: 43 Years in between: 13 Jim Walton Age he made first million: 34 Age he made first billion: 44 Years in between: 10 David Koch Age he made first million: 39 Age he made first billion: 49 Years in between: 10 Jack Ma Age he made first million: 35 Age he made first billion: 45 Years in between: 10 Steve Ballmer Age he made first million: 30 Age he made first billion: 38 Years in between: 8 Larry Ellison Age he made first million: 42 Age he made first billion: 49 Years in between: 7 Larry Page Age he made first million: 25 Age he made first billion: 30 Years in between: 5 Sergey Brin Age he made first million: 26 Age he made first billion: 31 Years in between: 5 Bill Gates Age he made first million: 26 Age he made first billion: 31 Years in between: 5 Alice Walton Age she made first million: 39 Age she made first billion: 43 Years in between: 4 Ma Huateng Age he made first million: 33 Age he made first billion: 36 Years in between: 3 Charles Koch Age he made first million: 31 Age he made first billion: 53 Years in between: 22 Jeff Bezos Age he made first million: 33 Age he made first billion: 35 Years in between: 2 Mark Zuckerberg Age he made first million: 22 Age he made first billion: 23 Years in between: 1