Leaves

 O leaves, you are so soft and green in the early days. 

When you come in this mortal land, You fade from the Sun, you need a good temperature to live natural.

 O leaves, you are so sweet and green, you are swinging with wind, you want to touch the sky, you are in your full joy, you are playing like a boy. 

O leaves, you are so dutifully for your family, you want to give them every pleasure, which is necessary, now you have great power to bear the Sun, you are behaving your family like a great son.

• 
  

 O leaves, you are so yellow and old, you are sitting alone, no one are your fellow, you are thinking, your good and bad acts, A strong wind comes and you down on the Earth, your all play now ends. 

It's great rule of nature.   Summery of the poem, baby, boy, man, then old age.