Answer:
To unravel me you need a simple key, no key that was made by locksmith's hand. But a key that only I will understand.
More precious than gold, but cannot be bought, Can never be sold, only earned if it’s sought, If it is broken it can still be mended, At birth it can’t start nor by death is it ended.
The older they are the less wrinkles they have.
This only turns over once you have travelled very far. What is it?
You can only have it once you have given it.
What never gets any wetter no matter how hard it rains?