I understand if you don't want to continue discussing this, Zephos, but I really do want to hear more of what you know about the subject if you have the time.
Is the average age of US citizens really declining? Even if it currently is due to immigration, shouldn't we expect it to gradually rise in the long run simply because people are getting older? Probably the biggest growing area of medicine right now is research into geriatric care and further extension of the already incredibly long average lifespan. Should we really think that this wave of influence the youth of America seem to be having is going to last? If anything, I feel like the elderly are going to become more and more influential over time. I mean, we're all going to be elderly one day. If we're lucky.
edit: And, you know, the whole reason why Ann Coulter is a thing is because there are a lot of people who see things her way. A lot of elderly people, probably. I get the feeling that people become more conservative as they get older.
All's I'm saying is that even if birth rates are stagnant/rising, they aren't rising as fast as death rates are falling, right?
edit 2: There's a huge hump of people in the 40-60 years range that's probably not going to significantly shrink over the next couple decades, but it does look like it's of a comparable size to the younger parts of the population.
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Both distributions should start to stretch vertically as time goes on, life expectancy rises and medicine improves. The male distribution at the top will start to look more like the female one, and the female one will only continue to get older, too.