As a kind of followupfollow-up from this question, I have another question.
How can a country balance its demographics in an ethicalethically and moral waymorally?
Of course, mass genocide and rapes are some of the ways, but they would not be embraced by the population in any sense of the word. This would be abhorred even by the international community.
Another way would be to "wait" until the things balance "naturally" - this works best to "phase out" older people in favor of the younger people - under some conditions: 1) the economy can survive the wait and 2) the young people are actively "doing" something to help things - which might not happen because of the bad economy.
And the results of trying to raise the retirement age are already very visible.
I am not sure if the same strategies would work to balance the young-vs-old, as well as male-vs-female.