Louvre "“ Gateway City Museum of Antiquities

The events in Wonder Woman take place after those of Batman v Superman: Dawn of Justice (remember that Bruce Wayne sends the original pic that Lex Luthor scanned). Early in the movie, we see Diana Prince holding down a normal job at the Louvre, which is perfect for someone of her age and level of knowledge.

Of course, we don't know how long she’s been working there, but it follows that if she’s been there for some time, people would wonder why she hasn't aged at all. But that’s not the point.

The point is that this is a reference to the comics of the 1990's, in which Diana held a similar position at the Gateway City Museum of Antiquities in her hometown of Gateway. Interestingly, Gateway is also The Spectre’s hometown.