1.) Father is ploughing in a field/farm

2.) He’s son is weak and follows his father round, stumbling and falling over.

3.) He dreams of being able plough and becoming strong like his father.

4.) He grows up and becomes strong enough to plough. Whereas his father has grown old and has become weak.

This poem shows how the father was strong, then he becomes weak. This is because of age, and growing old.