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We are grandparents and have friends who never had children. They usually have pets that they treat like children or grandchildren. You will be old someday, and if you don't have children and grandchildren, life will be barren. Even our friends who had children, but who don't have grandchildren, are always wondering about what is wrong with their rapidly aging childless children. Those who value the immediate and superficial rewards of careers and freedom over procreation are demonstrating the lower quality of their genes, and should and will be replaced by those who are of higher quality. The raising of children is really a very small slice of a persons life, but one that yields rewards far in excess of the costs.