What is the best gap between husband and wife in age?

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There is an old Chinese saying:"If wife is three years older than her husband, they will have a smart baby."But most people hope husband is much older in modern society. Foreign scientists discovered that 14 years gap between husband and wife is the best. But people often say that:"three years gap may bring about generation gap. The larger gap in age, the fewer common language. People usually write the expected age range on his Personal Ads. That shows age is important for husband and wife. What is the age gap between you and your partner? If you are not married, what is your ideal age gap?"