The answer is: He was younger

Job 32:4

In the Book of Job, Elihu’s entrance into the dialogue is quite fascinating, highlighting the dynamics of age and wisdom. Although he is much younger than Job and his three friends, Elihu’s decision to hold back reflects an essential aspect of ancient culture: respect for elders. Just as a fine wine gains depth over time, wisdom too often accrues with age. However, Elihu believes that being older doesn’t automatically mean one has the best insight.

Interestingly, discussions comparing age and wisdom swirl throughout the scripture. For instance, Paul, in the New Testament, nudges Timothy by reminding him that he shouldn’t let anyone despise him for his youth, suggesting that worth and insight can come from any age. Similar sentiments echo through Plato and Socratic dialogues wherein youth are often seen challenging conventional thoughts for fresh insights.

Elihu seems to recognize that although he might lack the group's years, his fiery passion and sharp observations bring something essential to the discussion. His youth doesn’t disqualify him; in fact, he uses it to offer a perspective that challenges the comfort of teachings established by age-old traditions.

Elihu’s excitement mirrors the enthusiasm of young minds bringing new ideas and perceptions into complex dialogues. It showcases how wisdom can transcend simple age hierarchies, a theme valid both in ancient times and today. Elitism surrounding ages often overlooks potentially transformative insights from the younger generations.