From a comment after the article:
I’m amazed at just how many have dismissed the 747 and claim she’s at her end, yet she still flies on. Here’s one fact that shows this: in 2014, there were more 747s sold than Airbus A380s. Let’s just count from the date of your article until the day the last 747 is retired. It’s going to be a long wait.
Just remember, they are younger than the B-52.