Yeah, my five year old is both weirdly obsessed with the idea of death but also weirdly not bothered by the concept. She is always asking if some person she learns about is dead, and always says we are "trying to die her" whenever we stop her from doing something she wants to do, but is never too distraught.

Sounds like her true form encompasses the entire universe of possibilities, so any time you limit her choices you are effectively killing off a part of her consciousness, for no reason but your own convenience or some vain attempt to prepare her for some vague 'real world'. By preventing her action you are literally denying her right to fully exist.

I’d say the true nature of death isn’t something we gain insight into the older we are, either.

Yeah, probably better worded as we don't understand the impact death has on others until we are older and have experienced those impacts ourselves.

I never quite experienced those impacts myself yet, but I had existential dread early on.

To a point. We better understand the hurt of those who remain.