Question

What is the literal meaning of “his young body is dying of responsibility" in my father's sadness?

Answer 1

Based on this line from "My Father's Sadness", the line  “his young body is dying of responsibility" means that, the speaker is aware that she understands that her father is dying, and that the burden or responsibilities of life is slowly taking away his young body, having a slow and painful death. Hope this answer helps.