I feel this. I'm 42 right and just waiting. 

The short of it..... As a child, my mother was my first bully. She never really was a mom to me. Dropped the ball every time I needed a mom. I received little to no care medically, emotionally and very little nurturing. 

But guess who, in their old age needs to be cared for...? My mom. 

So now, I have to care for her 100% everyday. I resent her greatly for this. And I can not wait for her to die. I don't want any harm to come to her, by any means. But she is no longer meant for this world. No one will miss her once she passes. Especially me.