Ur Tuck Everlasting av Natalie Babbitt (1932-2016)

"'How old are you, anyway?' she asked, squinting at him.
  There was a pause. At last he said, 'Why do you want to know?'
  'I just wondered,' said Winnie.
  'All right. I'm one hundred and four years old,' he told her solemnly.
  'No, I mean really,' she persisted.
  'Well then.' he said, 'if you must know, I'm seventeen.'
  'Seventeen?'
  'That's right.'
  'Oh,' said Winnie hopelessly. 'Seventeen. That's old.'
  'You have no idea,' he agreed with a nod."
ur Tuck Everlasting av Natalie Babbitt