JetStar does not want unaccompanied childern, cripples, spastics, blind, deaf and dumb, aged or otherwise infirm passengers. Such passengers are encouraged to either fly with JetStar's competitors or stay at home and don't travel at all.
We do not have the systems, staff or facilities required to assume responsibility for assistance and supervision of passengers.
For the avoidance of doubt, please see JetStar's Policy on "Independent traveller requirement - Children" and "Limited special assistance" shown at the following link:
At the airport - Travel information - Jetstar Airways
For passengers who are protected from discrimination by Australian Law, JetStar will begrudgingly undertake "Limited Special Assistance".
The law does not require JetStar to provide this service in a respectful and friendly way...especially if you check-in after 29 minutes before the flight due to lengthy queues even if caused by inadequate numbers of JetStar check-in staff...