For those who believe that birth order influences traits like personality and intelligence, a study of 377,000 high school students offers some good news: Yes, the study found, first-borns do have higher IQs and consistently different personality traits than those born later in the family chronology.
However, researchers say, the differences between first-borns and 'later-borns' are so small that they have no practical relevance to people's lives.
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There could be an initial attraction with others but it never seems to go anywhere.
I know it may be slightly limiting but nowadays, if a guy is an only child or youngest, I don't even try.
Of course your personal compatibility analysis is based on birth order, the most reliable predictor of personality. If you have many older siblings and are close in age to one or more of them, you can expect to be more like a lastborn than a firstborn, although you will have some firstborn traits by virtue of the fact that you have a younger sibling.
William Cane's new book on birth order and romantic compatibility, The Birth Order Book of Love, is the latest word on birth order and relationships.