First, the one you asked, is he or she?
If you known about someone when he was poor many years ago and now he is already rich, maybe he achieved it by his hardworking. If it less than a year or even months, you can say maybe he was lucky enough to win from lottery/gambling
what was asked by the OP was not appropriate...
A person's success, whether he is male or female is due to his/her hard work and luck, someone will not be lucky if the person is not working hard and just lazy at home. but the most important thing in life is luck, get a good job and career, a loyal partner, a good kid is a lucky.