I have read that it is possible to determine if a child will end up psychopathic as early as the age of three. This video appears to suggest that spinsterhood can be detected as early as five:
The video comes by way of Susan Walsh, who wryly anticipates the need to talk some sense into the girl in 15 years, even at the risk of costing humanity some very special Powerpoint slideshows. But the soliloquy does serve as a helpful reminder of the childish nature of the idea that women can do anything more useful, special, or important than that minor matter of perpetuating the human race.