I am there when you're born
yet I begin to fade away from day one.
I will stay until death
even if you choose to erase me.
Maybe even more, if you pass me to your children
My worst enemy? it once killed, but not a human being
who am I?
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Ignorance
It matches the title:
"I don't know" is an admission of ignorance.
"I'm there when you're born."
You are born knowing nothing.
"Yet I begin to fade away from day one."
You constantly learn more throughout your life.
"I will stay until death even if you choose to erase me."
No matter how much you learn in your life, there is always much more you don't know.
"Maybe even more, if you pass me to your children."
I'm having the hardest time with this clue. I think it means that if you don't value education and learning in your family, your kids are unlikely to do so themselves.
"My worst enemy? it once killed, but not a human being."
Curiosity, which prevents someone from being comfortable with ignorance, killed the cat.
Possibly a stretch but:
Life
I am there when you're born
When your life begins
yet I begin to fade away from day one.
As soon as you're born, you start to die
I will stay until death
When you die, your life leaves you
even if you choose to erase me.
You can choose to take your own life, but it still leaves you
Maybe even more, if you pass me to your children
You can create new life by reproducing
My worst enemy? it once killed, but not a human being
An Extinction Level Event -- something that destroys life on a massive scale, such as the one that wiped out the dinosaurs (which killed, but not humans).
Is it
memory
I begin to fade away from day one.
Memories are doomed to fade from the beginning
Maybe even more, if you pass me to your children
You can pass on memories in order to prolong them
I'm not sure about the last line but I'm sure it is applicable
I think it is
Youth
I am there when you're born
When you are born you are young
Yet I begin to fade away from day one.
You start becoming older day by day and hence youth starts fading
I will stay until death, even if you choose to erase me.
You will always be younger to someone or the other till you die
Maybe even more, if you pass me to your children
One has children, who are young when they are born
The reasoning for the last line isn't hitting me! :/