No significant difference.
Student or Learner
I am wondering if the comparisons "like" and "as" are interchangeable in my sentences, or do they change the meaning of the sentence.
1. All his life, Peter behaved like a gentleman.
2. All his life, Peter behaved as a gentleman.
***** NOT A TEACHER *****
"I would simply have trusted you to behave as a gentleman should." "Perhaps," said Jordan, still smarting from Darcy's insult. "Andrew is more apt to behave like a gentleman than you, Sheldon."
-- Jean Sutherland, Ties That Bind (1986). Accessed through Google "books."
1. "He spoke like a lawyer." [He was NOT a lawyer, but his speech was similar to a lawyer's.]
2. "He spoke as a lawyer." [He WAS a lawyer. So he was giving the kind of legal advice that lawyers give.]
Authority: Quirk and Greenbaum, A Concise Grammar of Contemporary English (1973).
ONLY some thoughts of mine.
1. It might be a good idea to use "All his life, Peter behaved/ acted like a gentleman" in most situations.
2. It might be a good idea to use "as" only if a verb follows the word "gentleman."