Thanatophobia

I'm sick for days. Heat (El Nino) is taking its toll on me. Last night I was awakened by a quiet sound of sobbing...

Me: Oh why are you crying my love?

Juan: I'm afraid that you're not gonna wake up tomorrow because you're old and sick.

Me: I'm just sick but not old. 80 is old. I'm only 42, remember? Let's sleep. Don't worry so much my love. 

Juan: Ok, mom, I love you.

You might want to read How Do You Explain Death to a Child.