If your culture's strategy for success involves having fewer children and having them later in life, don't expect to see an abundance of successful people over the next several generations.
This reminds me of a witty line I heard in a 1940's movie the other night. The setting was Victorian England (I think). The heroine made some comment about the value that the empire placed on virginity. A wise older man corrected her: "You mean 'chastity'-- no empire could expand very far on virginity" or something like that. Very cute.
