Idioms describing human death.

Old age is like a candle swaying in the wind ―― the autumn of life.

drag out one's feeble existence

Only a faint breath of life remains.

have only a faint breath of life left

Breathing is like fish.

Dawn doesn't know what will happen at dusk ― it's in an unstable state.

The sun is setting behind the western hills-like a sunset.

Beauty will die

Female remains

Fragrant fragrance dies ―― Beauty dies

Face imminent danger

Death may come at any time.