 545, now here's a little tidbit of info you can take when you go out to dinner with friends or family this weekend. We are just a few days away from the Caesar salad turning 100 years old. July 4th is actually the day. The Caesar salad was invented by an Italian chef in Mexico on an American holiday a century ago. Caesar Cardini, who lived in San Diego, opened his restaurant Caesar's in Tijuana the year prior to avoid prohibition in the U.S.,