What is the difference in how Beowulf is portrayed in the two halves of the poem?

In the beginning, Beowuld is described as courageous, impetuous, and determined to make a name for himself with his bravery. In the end, he is an old man, who is determined to protect his people and once again prove his bravery. In my opinion, he wished to die as a hero..... just as he lived as a hero.