This number is apparently unlucky in Italy, becuase the Roman numeral for the one-seven number is an anagram of the Latin for I am dead. It also appears to be an unlucky number at Wimbledon 2013, as 17 appears to be a significant number for at least four of the upset victims so far.
So this is rehab.
It is the age of sweetness and innocence in a girl. Sweet sixteen means basically the same thing.
Use in Normal SpeechEdit
When pleading innocence.
"What, me? I'm sweet seventeen and never been kissed!"