Those numbers actually still seem troubling for Republicans. Democrats just need to hold onto that generation as it ages because the next generation isn't going to be much better for the GOP as it will inevitably be very diverse.
This is one reason why Trump might be beneficial long-term in terms of partisan advantages for Democrats. People growing up under so many years of one-party White House rule will inevitably build grievances towards that party as said party takes the blame for years and years of troublesome issues - terrorist attacks, economic problems, various other social conflicts, etc, which could weaken the bonds to newer generations, particularly if the party can't adapt to changing attitudes.
However, with Trump in and widely despised by young people, he could serve as a booster shot to the Democratic Party in that he'll drive young people even further away from the GOP and help prime teenagers against the Republican Party as they enter the electorate. Especially if we get a recession sometime in the next 4 years. The fact that the GOP has done pretty much nothing to adapt to newer generations compounds that problem bigly.
At this point, I'm just wondering exactly when the GOP will win the youth vote nationally, which would realistically require winning substantially more minorities than they are now. It would represents a long-lasting breakthrough in the electorate. If they can't, they will never win young voters and thus (likely) the future.
