Conversation so far:
What is Art Spiegelman's style?
His is a style of labored simplicity, with dense visual motifs which often go unnoticed upon first viewing.
How old was he when he began developing his unique style?
CANNOTANSWER.

Question: Has he received any critical acclaim for his artistic style?
Self-contained rewrite: Has Art Spiegelman received any critical acclaim for his artistic writing style?