After the fall, man had need of protection. He needed a covering, for he had been exposed to sin. God made coverings for Adam and Eve, at the expense of the life of an animal. The wages of sin is death, Roman. 6:23. Death reigned over man from Adam to Moses, Rom. 5:14. God’s law became their covering and protection until His Son Jesus could pay the ransom for that original sin. Jesus became the protection for any who would call upon His name and make Him Lord. That protection includes the ability to live long upon the earth Psalms 91:16, and to live united with God after ones last breath, 1 Thes:4:17.
Rom.5:14
Nevertheless, death reigned from the time of Adam to the time of Moses, even over those who did not sin by breaking a command, as did Adam, who is a pattern of the one to come
Rom.5:12-17
12 Therefore, just as sin entered the world through one man, and death through sin, so also death was passed on to all men, because all sinned. 13 For sin was in the world before the law was given; but sin is not taken into account when there is no law. 14 Nevertheless, death reigned from Adam until Moses, even over those who did not sin in the way that Adam transgressed. He is a pattern of the One to come.
15 But the gift is not like the trespass. For if the many died by the trespass of the one man, how much more did God’s grace and the gift that came by the grace of the one man, Jesus Christ, abound to the many! 16 Again, the gift is not like the result of the one man’s sin: The judgment that followed one sin brought condemnation, but the gift that followed many trespasses brought justification. 17 For if, by the trespass of the one man, death reigned through that one man, how much more will those who receive an abundance of grace and of the gift of righteousness reign in life through the one man, Jesus Christ!