Tuck Everlasting (Paperback, New edition)

Also available as an audio book
Doomed to - or blessed with - eternal life after drinking from a magic spring, the Tuck family wanders about trying to live as inconspicuously and comfortably as they can.  When ten year old Winnie Foster stumbles on their secret, the Tucks kidnap her and explain why living forever at one age is less than a blessing that it might seem.

'Someone ought to start spreading the word that Natalie Babbitt is not only a children's writer ... the style is so fine and subtle that grownups too will take real pleasure. Tuck Everlasting is one of the best books ever written - for any age.' Anne Tyler, New York Times