The guy doesn't know much about programming languages if he thinks BASIC is only 20 years old. I was playing with it more than 30 years ago. The first computer I bought (more than 20 years ago, I might add) even came with a neat function that would automatically number the lines for you. I quit writing simple programs in BASIC when Microsoft took away the line numbers.
I think he was referring to MS Basic that came with DOS. Still a bit over 20 years, but not much.