Theories abound about the effects of birth order on personality, success, and other life outcomes. Last week we quizzed our readers on traits that differed between 23andMe customers who were oldest children (firstborns) versus youngest children (lastborns). So what were the correct answers? Read on...

Ever felt like your studious oldest sibling was more responsible? Or that your rebellious younger sibling always got the most attention? Our latest quiz questions our thoughts about the effects birth order has on personality, accomplishment, and life choices.