There are several synonyms for the term "vintage agent," all of which convey the idea of someone who deals with vintage or old-fashioned things. One such synonym is "antique dealer," which specifically refers to someone who buys and sells antiquities. Another option is "collector" or "curator," both of which imply a passion for collecting and preserving vintage items. A "vintage specialist" or "retro expert" may also be used to describe someone who has a deep knowledge of vintage fashion, art, or furniture. Lastly, the term "nostalgia merchant" can be used to describe someone who sells items that evoke a sense of nostalgia or sentimentality for a bygone era.