Determining the exact oldest functioning consumer product still available for sale in stores today can be challenging, as it depends on various factors such as the definition of "consumer product" and the specific stores considered. However, one example often cited is the Coca-Cola soft drink, which was first introduced in 1886 and is still widely available today.
Coca-Cola has maintained its popularity and has become a globally recognized brand. While the recipe may have evolved over time, the core product remains in production and is commonly found in stores worldwide. It is important to note that this example represents a single product within a specific industry and may not encompass the entire range of consumer goods. Other long-lasting products may exist in different categories, such as certain food items, toiletries, or household products, but identifying a definitive "oldest" functioning consumer product can be challenging due to changing market dynamics and product lifecycles.