And also does that mean that every polish man that is born in poland has to serve in the army at some point of his live?
in theory yes but many people successfully avoid it. for the last time dO NOT worry about getting drafted, your family in Oz are probably just scaring you for fun. if you left Poland at a young age there is no way they would have any record of your existence and therefore no place to send you a notice to report for medical screening, which would then establish your eligibility. relax, they dont waste time chasing long-lost Poles like you...