NASA's Don Pettit says that they cannot go to the Moon. How come?

What is your opinion on what NASA's Donald Ron Pettit stated during one of his interviews? He said, "I'd go to the moon, but we don't have that technology anymore". How is it possible that we do not have the technology in the 21st century?

Allegedly in 1969 we landed on the Moon. Yet 49 years later we lost the technology. Weird and strange it is.