While it is highly likely that attachments made in childhood influence well-being later in life, one cannot say that that is the only factor. There are an incredible number of factors that influence us. One that is decided from birth, for example, is our genes. The genetic code we are born with influences everything about us, so isn't it probable that it influences how well we do in life? Also, the environment we are born into greatly influences our future. The resources available to us growing up can greatly alter our paths in life.