Which character expresses a desire to find a Christ who will teach him how to be an old man?

The character who expresses a desire to find a Christ who will teach him how to be an old man is indeed Padre Balzone. This longing reflects his search for spiritual guidance and understanding as he faces the complexities of aging. Padre Balzone is portrayed as a wise and introspective figure within the narrative, which allows him to grapple with deep existential questions about life, morality, and the passage of time.

His desire to learn from a Christ who embodies the wisdom of age highlights the themes of mentorship and the exploration of one's spiritual journey throughout "Fifth Business." This search is significant because it underscores the novel's broader discussions about the roles of faith and morality in personal development.

In contrast, other characters, like Dunstan Ramsay, Paul Dempster, and Milo, have their own unique arcs and concerns throughout the story that do not center on finding a Christ figure for guidance in old age. Dunstan is preoccupied with his own identity and the events of his past, while Paul Dempster evolves through his struggles with his identity as a magician and artist. Milo, on the other hand, navigates his own complexities without expressing this specific spiritual quest that Padre Balzone embodies.