I'm not sure exactly what the "approach" is that I've outlined. All I've said is that the GOP can't continue to discount and ignore the youth vote (there are other demographic problems, but only referenced the youth in this thread). That's not a strategy as it is so much an observation of the evidence and a statement of fact.
The core of the Republican party is aging. That's not going to change in the foreseeable future because we've abandoned the college campuses and have ceded the younger demographic to the Dems.
I offered no advise as to strategy, platform, policy or ideas. I've just stated that the quantitative facts that unless the GOP can reduce the Democrat advantage it enjoys in the only demographics that are growing in the US, the mathematical viability and relevance of the Republican party is certainly threatened, and perhaps existentially so.