“Nicodemus saith unto him, How can a man be born when he is old? can he enter the second time into his mother's womb, and be born?”
King James Version (KJV)
3:4 When he is old - As Nicodemus himself was.
Joh 3:4 How can a man be born again when he is old? The question of Nicodemus indicates his surprise, skepticism and misapprehension of what Jesus meant.