The fireplace, lacking firewood, flames already starting to lose their vigour.

The activity of foreign trade has been declining of late.

As civilization advances, poetry almost necessarily declines.

The wind abated a little.

He wishes to resign on the grounds that his health is failing.

He declined in health.

His powers are failing.

His strength slowly declined.

His popularity was at a low ebb.

His eyesight is failing.

His health has begun to decline.

His memory has been decaying because of age.

His influence is still potent.

Old age has undermined her memory.

As we grow older, our memory becomes weaker.

As I grew older, my health declined.

Age diminished his strength.

The light became weaker and weaker.

The typhoon has lost its power.

My eyesight is beginning to fail.