<p class="ingestion featured-caption">From the Big Mac to Chick-fil-A's iconic chicken sandwich, these fast-food menu items are over half a century old.Irene Jiang/Business Insider</p><ul class="summary-list"><li>Many popular <a target="_blank" class href="https://www.businessinsider.com/fast-food-menu-items-cut-pandemic-havent-come-back-2024-8">fast-food items</a> were invented decades ago and remain unchanged.</li><li>Chick-fil-A's chicken sandwich uses the chain's original recipe.</li></ul><p>Many chains are experimenting with new menu items, like <a target="_blank" class href="https://www.businessinsider.com/taco-bell-cheez-it-crunchwrap-supreme-review-2024-6">Taco Bell's lineup of Cheez-It items</a>, as well as expanding upon old favorites — think Burger King's Fiery Bacon Whopper or Wendy's new saucy nuggets.</p><p>While introducing new and exciting menu items is one way to grab a customer's attention, there's also something to be said for chains keeping their oldest, most popular menu items at the forefront of their businesses.</p><p>From McDonald's signature Big Mac to the original <a target="_blank" class href="https://www.businessinsider.com/taste-test-mcdonalds-new-chicken-sandwich-chick-fil-a-2021-2">Chick-fil-A chicken sandwich</a>, which uses the same recipe in restaurants today, these fast-food menu items have stood the test of time.</p><p>Here are 10 fast-food menu items that you probably didn't know were more than 50 years old.</p>