According to the Bible. In book of Ezekiel, that Lucifer who is called Satan after he reveal against God from heaven was thrown here on Earth including all the black angels or demons. It is estimated that 1/3 of Angels in Heaven go with Lucifer. When Lucifer and One third of Angels were thrown on Earth the Earth was void and empty. It's very clear that there in no people before Adam and it's only Angels in heaven are alive. I believed if there are human being or people before Adam they will not die they were immortal but according to the Bible there were no people live on earth before Adam and Ever. According tot he Book of Genesis When Adam was created by God by taking the clay/soil form of a man and God breath on his nostril cause that soil/clay become living creature and God called him Adam, And while Adam is alive in Garden of Eden He is immortal why? He did not committed sin. Sin is stepping against the law of God and after years passed Adam was lone and God created Eve our of his womb and that is why God called her woman because she is created from the womb of a man. It is very clear that before God gave commandment to them Adam and Eve is immortal but the moment they violate the law of God which Gods says Do not eat the fruit of good and evil on the tree at center of the garden and God said if you eat that fruits of good and evil you will surely die which means on that moment before violating the law of God of not to eat that fruits of good and evil they are immortal. They became mortal when they follow Satan in the Garden. Because the Serpen who is Satan twist the commandment of God by saying if you eat that fruits of good and evil you will surely not die but you will become like GOD. When Eve heard that she tried to eat and give some to Adam. So that's scene that she eat and Adam also eat they become mortal and God told them Now you can't eat any foods here in Paradize but you surely work and produce foods. Adam and Eve were thrown out of paradise and God told them you become mortal and the Book of Psalm said your life is numbered up to 70 only average.