The thing about human death is, that you have to wonder who is dying of you. You as an infant already died if you grew up to be a youth, and you as a youth died when you grew up to be an adult....So on and so forth.

It is obvious already that individual constantly undergoes changes. The analogy here is with caterpillar - chrysalis - butterfly. So if we're not afraid of growing up (transforming from one stage of life to another) than how is physical death any different?

"I was perfectly content before I was born, and I think of death as the same state"

Bingo!