Dylan Thomas in his poem ‘Do Not Go Gentle Into That Good Night‘ has reversed the stereotype idea about the relationship between age and strength. People generally feel that our strength goes down with the old age. That is actually true about the physical strength. But the poet here argues that when death nears us, people don’t go gentle into ‘that good night’. They try to stay mentally strong against illness and death. Wise men, good men, wild men, grave men — all ‘rage against the dying of the light’. It is because they know or feel that they have wasted some of their valuable time in useless stuffs and now if they get some more time, they can do wonders. That is why all men try to fight against the old age, illness and death. All try to live longer.

This reversal of the normal relation of age and strength is believed to be a deliberate attempt from the poet to support his dying father by giving him some encouragement to live.