Not Ready

You can’t stop a leaf from falling of a tree like you can’t stop the sun from rising in the morning.
You can’t stop a leaf from falling of a tree like you can’t stop a little kid from growing. up.
You can’t stop a leaf from falling of a tree like you can’t stop a person from dying when his time has arrived.

Its inevitable
 
Maturity is the state, fact, or period of being fully developed.
Just because you tell a little kid to grow up that won't make him will start growing facial hair. 
And just because you plant a seed on the ground doesnt mean that a tree will frow from that  instantaneously.

You can’t force something to mature before it’s its time.
Yeah you can take an apple from a tree but that doesn’t mean the apple is ready. The flavor will be distinct from an apple that fell down from the tree on its own. Just like a bird leaves its nest when it’s old enough a person will leave his mother’s house when he think he can be successfully independent.