Are you suggesting that Obama got chosen as president not once, but twice, just because he was younger than the opposition? His policies, or those of his party, had nothing to do with it, just his age? Do you think Americans are totally dumb and interested only in physical appearance as criteria for the biggest job in the world?
"Young people" are the most unreliable, unmotivated voting bloc out there. They're fickle, fair-weather folks who as likely to come through on voting day as they are do stick around for a teenage pregnancy.
Interesting thoughts, but social issues are going to be a sticking point if the republicans keep clinging to them, as traditional republicans tend to favor positions that favor white straight male christian gun loving americans, a group that is no longer a significant majority. Still a majority but not enough to win with alone. On top of that, thanks to the internet, it's easier for people to research the financial policies of the republicans and take note that they tend to favor tax cuts to the rich and taxing the needy. While the rich may fund the politicians, they don't make up the majority of voters.
So to sum up, the republicans need to do some major retooling...or really step up on their propaganda if they want to win. They're making the mistake of appealing to financial liberty, which tends to favor the rich. But the younger generation votes they're looking for tend to be young 20-somethings that don't have a whole lot of money to worry about and would prefer social liberty.