I think whoever was assembling the “lower third” for CNN’s news segment on the late great Jimmy Buffett (RIP, you magnificent bastard and musical role model of mine) was trying to choose between saying that he’d played for over 50 years or 5 decades, settled on “50 years”, and forgot to change the final word.
Consider this another reminder to use processes and tools to double-check your work before you put it out into the world, especially if it’s a rush job.