(CNN) -- Presumptive Republican presidential nominee Mitt Romney used an event at the USS Wisconsin in Norfolk, Virginia, Saturday to announce Rep. Paul Ryan, R-Wisconsin, as his vice presidential pick. Romney's choice of Ryan is considered by political observers to be a bold, risky move that could potentially change the dynamic of the Oval Office race. 

CNN Exclusive: How Romney chose his running mate 

By the numbers, here's a look at Paul Ryan: 

28 - Ryan's age when he was first elected to Congress, in 1998. 

3 - Children with his wife, Janna - Liza, Charlie and Sam. 

Polls: Paul Who? 

104 - Times Paul Ryan's Wikipedia entry has been updated so far today, since Ryan was announced as Mitt Romney's running mate. 

Ryan's selection energizes both sides 

$5 trillion - Proposed spending cuts over the next decade in Ryan's 2013 budget proposal, "The Path to Prosperity," relative to President Obama's budget. 

Paul Ryan, top GOP voice on fiscal matters 

25% - The corporate tax rate under Ryan's budget plan. 

2 - Number of proposed federal income tax brackets, 10% and 25%, under Ryan's plan. 

6 - Number of current federal income tax brackets. 

Romney camp prepares Medicare defense after Ryan pick 

173,783 - Followers for Ryan's preexisting Twitter account @RepPaulRyan. 

57, 744 - Followers for Ryan's new campaign-related Twitter account @PaulRyanVP that was launched today. 

153,000 -"Likes" for Ryan's pre-existing Facebook page. 

64,000 - "Likes" for Ryan's new campaign-related Facebook page launched today. 

6 - Number of days a week you have to work out on the P90X exercise regimen. Ryan is a big fan of the regimen. 
What year was he first elected to Congress?
1998