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 old than her husband,they will have a smart baby."But most ppl hope husband is much older in modern society.Scientists discovered that 14 years gap between husband and wife is the best.But ppl often say that:"three years gap may bring about generation gap.The larger gap in age,the fewer common language.Ppl usually write the expected age range on his personal Ads,that shows age is important for husband and wife. what is the age between you and your partner? if you are not married,what's your ideal age gap?please share you opinion!