At the beginning, sickness was not part of us. God did not plan that we should be sick and infirmed. We were blessed with a healthy body.
God wants us to live in good health. That is what the Bible says. The Bible says that he wishes above all things that we should be in health and prosper as our souls are prospering.
If God could say that he wishes above all that we should prosper, it means that he is very interested in our health. Our body needs to be in good condition for us to be able to serve God well. We need a healthy body to do the work of God on earth.
It is possible that we can attain a healthy status of our body all of our lives till death. It is possible to live healthy. It is possible to attain a healthy life and be in good health. It is possible to get a healthy status of our lives till death. It is not that people must always be sick before death.