how many age difference between husband and wife is good for make a good family

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hi all, how many age difference between husband and wife is good for make a good family life. I heard many people says age is not a matter for marriage, but think if one old guy age above 80 marry a girl 18 means they will be happy their entire life? sure its not happen. my another one point is some people marry a girl she is above his age just one or two years. while compare this second case with first means this one is better. but my personal experience is wife should be 2 to 6 years younger than hubby is good for make a perfect couple.what is your opinion?