Observe that a body has its own life. It breathes on its own, communicates internally, informs you that it needs water or food, takes what it needs and goes about doing things inside to grow till about 20 yrs. It continues to sustain for another 20 yrs and reaches its peak. After this, it starts to struggle and needs more support to keep up with its own degeneration and finally some parts somewhere gives up and that forces the other parts to give up also and the whole body dies. You live in it till it dies, use it for your actions, support it at various stages all along and die with it.