Age
17 of the people on this year's list are 35 or younger.
Rank Name Company Age
2 Mark Zuckerberg Facebook 25
29 Aaron Patzer Mint.com 28
31 Matthew Flannery Kiva.org 32
4 Aditya Mittal ArcelorMittal 33
6 Tiger Woods   33
33 Erin Burnett CNBC 33
21 Marissa Mayer Google 34
23 Xiaofeng Peng LDK Solar 34
25 Max Levchin Paypal, Slide 34
31 Premal Shah Kiva.org 34
32 Rio Caraeff Vevo 34
35 Charles Best DonorsChoose.org 34
5 Biz Stone Twitter 35
9 John Arnold Centaurus Advisors 35
13 Cesar Conde Univision Networks 35
27 Tony Hsieh Zappos.com 35
39 Casey Wasserman Wasserman Media Group 35
1 Sergey Brin Google 36
1 Larry Page Google 36
3 James Murdoch News Corp. 36
11 Lorenzo Simonelli GE Transportation 36
19 Seth MacFarlane Family Guy 36
26 Josh James Omniture 36
37 Keith Meister Icahn Capital 36
5 Evan Williams Twitter 37
15 Kevin Plank Under Armour 37
36 Gina Bianchini Ning 37
8 Jason Kilar Hulu 38
10 Marc Andreessen Netscape, Opsware, Ning, Andreessen Horowitz 38
12 Tim Armstrong AOL 38
14 Raul Vazquez Walmart.com 38
18 Pony Ma Huateng Tencent 38
22 Paul Touradji Touradji Capital 38
24 Eran Egozy Harmonix Music Systems 38
38 Wendy Clark Coca-Cola 38
7 Jonathan Gray Blackstone 39
16 Jay-Z Translation Advertising 39
16 Steve Stoute Translation Advertising 39
17 Meredith Whitney Meredith Whitney Advisory Group 39
20 Kevin Warsh Board of Governors of the Federal Reserve System 39
24 Alex Rigopulos Harmonix Music Systems 39
28 Brian Sack New York Fed 39
30 Danny Rimer Index Ventures 39
34 Ralph Gilles Dodge, Chrysler 39
40 Ben Silverman IAC 39
From the Nov. 9, 2009 issue
Quick Vote
Who's more influential?
  • Google's Sergey Brin and Larry Page
  • Golfer Tiger Woods
  • Financial analyst Meredith Whitney
  • Rapper and entrepreneur Jay-Z
Quiz
Can you pass the '40 under 40' test?
See how much you know about business's hottest rising stars
1. Which member is a fan of Green Day and an avid fencer?
a) Facebook's Mark Zuckerberg
b) Google's Sergey Brin
c) Under Armour's Kevin Plank
d) Roc-A-Fella's Jay Z
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