Karl estimates he and his wife, who is 73, eat all but three of their meals every week at Whataburger. The order is usually the same: a Whataburger with grilled onions and jalapenos for him, a Justaburger with grilled onions for her. Both of them order their buns toasted. Their love affair with the chain began back in 1963, when the couple got their first taste.
Bites - Couple in their 70s aim to visit 722 burger joints