In Reply to: Minimum age for flying with adult posted by 5Gwenda on Sunday, 9. September 2012 at 10:34 Bali Time:
"Any child aged 5-11 years (who is not yet 12) travelling alone must be booked as an Unaccompanied Minors (UMNR).
If your child is under 12 years of age and is not booked as an UMNR, they must be accompanied by another person 15 years of age or older.
Any child aged 12-15 years (who is not yet 15) may also travel as an UMNR - if requested by the parent/legal guardian." Virgin
Some airlines may have other restrictions or a limit on minors travelling unaccompanied