My sincere sympathy to each of you for your loss. Psalms 90:10 says that the usual life span is 70 or 80 years. When man was created, it was God's purpose that he would live forever. Romans 5:12 explains why death and sickness occurs. His purpose has not changed. He assures us that he will restore life to all who are in his memory right here on earth under the best of conditions.
Revelation 21:3-5
John 5:28,29
Psalms 37:29