I went through the PG 2009 rankings and compared the ages of the players ranked 1-20 and the players ranked 491-510. Rather than telling you right off what, if any, the age difference was between the two groups I'd like to get some guesses. Anybody brave enough to make a guess as to the difference in average age between the two groups is? Once I get 10 or more guesses I'll let you know what the results were.
Please feel free to explain the rationale behind your guess.