In my opinion, this plot represents one of the MOST important facts about American society today. The white population has a huge extra hump of older people that other demographics don't have. 
I think that hump could explain why there's so much fear around how America is "changing". The younger generation is more mixed so the normal intergenerational conflict is perhaps being magnified by the fact that the younger generation doesn't "look like" the older generation.
I suspect age contributes to racial differences in politics in two ways. The first is obvious. Young people have different wants and needs from older people. So it matters that whites are proportionally so much older.
Second, the plot suggests that younger white people probably have a support network that's filled with lots of older white people. That probably makes a big difference in how much younger white people need to rely on government.
It would be silly to think that one factor could explain everything completely. But I do think that if you factor in relative age and having older support networks, almost everything about racial politics today makes a little bit more sense.
The huge size of the older white hump also gives some insight into why they have the numbers to hold on to political power, and why they need so many resources to begin with relative to the other much younger demographics.
Bottom line: it's possible that the current racial anxiety has more to do with the white population aging than anything non-white people are doing, and if the median age of whites was under 30 like it is for other groups, maybe there would be a lot fewer race problems right now.
I'm not a demographer so please feel free to chime in. I just thought this plot was fascinating and I haven't seen people discussing this elsewhere.
One more interesting observation. As far as I can tell, the whole narrative about Gen X being smaller than Millennials and Boomers seems to be a completely white population specific thing. Other groups don't look like that.
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