Child fare applies from 6 up to and including 19 years. Children under the age of 6 travel for free.
At 20 you are no longer entiteled to child fare, and it is your responsibility to change your ticket.
Remember that you must be able to show that you are entitled to a discount upon request. Passengers who fail to produce a valid ticket during an inspection will receive a fine.
Saturdays, Sundays and Bank Holidays in Norway (not the 17th of May), you who are 20 years or older can bring along 4 children under 18 for free with any adult, senior or student ticket on travels with bus or tram in one zone.