I agree with WSD. The parents will gravitate toward the logical generic description of the name. This is the generic title for the blog of 'coming of age'. Of course it depends on who is driving. Either way Parents and 'hormonal' Teenages alike will visit, if only once.
Estibot: $550
Monthly Searches, Broard: 27,084
Typeins: 88
DomainIndex: $2,530
Global searches for "teenageblog" 25
Typeins: 0
I'm thinking $1,000 - $1,500 as an end user who would actually build upon this name and concept.
Regards.matt