A guy walks out the back gate of his house. He is young. He is wearing a ball cap pulled low on his brow against the morning sun.
He smacks his head, hard, on a low hanging branch. He considers cutting the branch off to prevent a repeat head butting, However, he is busy, as the young so often are. He never gets around to removing the branch.
Time passes. The young guy ages. Eventually he is no longer young. He is decidedly old.
He shrinks, as old guys do. The tree grows taller, as trees usually do.
The guy now goes out his back gate and never comes close to hitting his head on the tree branch.
Ain’t nature grand!