1 John 2:17 The world and its desires pass away, but whoever does the will of God lives for ever.
Generation after generation of people come and go and the desires and lusts of their hearts, minds and bodies come and go with them. There is nothing of this earth that can be relied upon that will span more than one generation because nobody lives more than that.
But God says that we should be listening to Him because he does want to give us everlasting life – life that goes beyond our mortal generation.
When our bodies die, as they will, we continue on in our souls. Whether we live with God forever or face eternal death alone is our choice because God has given us that choice.