It looks like he might have Alzheimer's. He says he is ready to die and go to heaven. There are many issues raised in this question. Most of them can be addressed only minimally here. All people as they age will weaken and become frail and die.
Death is never dignified.
God did not create people to die but to live. Death, as a result of sin, is not pretty nor pleasant. We cannot avoid that fact, but we can lovingly provide comfort and care for dying loved ones. God alone is the terminator of life, and we are simply His stewards. Regarding your last statement, all Christians should be ready and willing to go to heaven.