That elderly gentleman comes to the park every day to play chess.
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Polite vocative for an older man you don't know — equivalent to 'sir' or 'old gentleman' in friendly speech. Compare: 老大爷 (lǎodàye) is warmer/folksier; 大叔 (dàshū) is for middle-aged men; 老伯 sits between, slightly more formal-respectful.
