Remember now thy Creator in the days of thy youth, while the evil days come not

It is a lucky youth who can look to God while he is still young enough to work hard in the vineyard of the lord before old age comes.

Nor the years draw nigh, when thou shalt say "I have no pleasure in them;"

As we age, we lose the vitality of youth to do the things which, when were young, we most desired. We become too tired to enjoy the pleasures of life.

While the sun, or the light, or the moon, or the stars be not darkened, nor the clouds return after the rain.

Refers to the earliest signs of changing eyesight.

In the day when the keepers of the house shall tremble,

The keepers of the house are the arms, shoulders and hands. The trembling comes with the feebleness of old age.

And the strong men shall bow themselves.

The strongest of men cannot escape the inevitable; old age weakens everything, nothing can stand up against it.

And the grinders cease because they are few,

In reference to the teeth, the chewing stops as we begin to lose our molars. Often they do not meet the ones that are left.

And those that look out of the windows are darkened.

The windows are the eyes. Failing sight is common in old age.

And the doors shall be shut in the streets, when the sound of the grinding is low.

The doors are the lips; the streets are the mouth by which nourishment enters; the sound of the grinding is the human voice. In old age, when the teeth are lost, mumbling is a very common attribute.

And he shall rise up at the voice of the bird.

The bird is the cocking rooster. In old age, mankind is more restless in his slumbers and early rising is a habit of many.

And all the daughters of music shall be brought low;

The daughters of music are the ears. The voice loses its strength and hearing becomes less acute in old age.

Also when they shall be afraid of that which is high

In the declining years, men fear to scale heights, which, in their prime, they ascended with ease and grace.

And fears shall be in the way;

Timidity is a common fault of older people. They are filled with apprehension at the first sign of danger.

And the almond tree shall flourish,

Refers to the white flower of that tree, significant to the old, when the hair of the head shall become white.

And the grasshopper shall be a burden,

Again refers to the weakness of old age. Even the weight of so small a thing as a grasshopper is a burden.

And desire shall fail;

The appetites and desires of youth cease in the declining years

Because man goeth to his long home,

Literally, to his grave as a final house for the body, or "that undiscovered country from whose bourne, no traveler returns."

And the mourners go about the streets;

Refers to the custom of public mourners, who walked the streets and publicly lamented the passing of one to the other world

Or ever the silver cord be loosed, or the golden bowl be broken,

Refers to the spinal cord with the silver marrow inside. The golden bowl is the brain; its yellow color. and shape. With death both the silver cord and golden bowl break down completely.

Or the pitcher be broken at the cistern;

The pitcher is the great vein bringing blood to the ventricle; here referring to as the fountain.

Or the wheel be broken at the cistern;

Refers to the network of arteries, which receive the blood from the left ventricle or cistern and distribute it over the body.

Then shall the dust return to the earth as it was, and the spirit shall return to God who gave it.