Everyone is different.

We all so afraid of dying cause now we have a lot of things to do.
When u get old and sick. Suffering everyday. Then you'll be mentally weak to live on.

Those that still fight it might have something they want to experience before going. Say seeing their son to be successful / daughter to get married / having grandchild or could be afraid of going far from their child/spouse and not able to see them anymore.

This is the time you care for them. Like how they cared for you when ur a baby. Whether they want to live on or not. Do your best to give them love.

As i said above. They have their reason. Maybe u can ask them instead?

My mom told me she not afraid to die. Just scare nobody take care of us. For her, we will always be her little kid no matter our age. She died after fighting cancer for 3 years.

Nobody has ever experience death. Some believe in heaven/hell and some not. The next destination could be more terrifying than the current suffering.