Does our birth date affect us?

The statistics in the book “Outliers” by Malcolm Gladwell say that people that are born in January, February or March have a better chance to become a successful hockey player than people that are born at the other months. The reasons that are given are that the fact of being born at the beginning of the year includes the advantage of being some months older than the other children and because of this fact this children are steps farther than the others. Personally, I think that this fact doesn’t count too much. For example, I grew up as an only girl with four brothers, two of them older and two younger than I. Because of that I grew up as a tomboy, I learned how to run, climb trees, play soccer and fight.I was rough, I was tough. And after I got the female genes and I behaved like a boy during my childhood I was lucky of getting influenced by both sides, the male and the female side. I think that this was a gift, although my poor mother used to say that she rather had four more boys than a daughter like me.