Hello Quupimbe19
No group or age discounts are available.
Cheapest fares are Supersaver Tickets (only valid in the selected trains) of Saver Day Passes (valid in every train). The online timetable will give you the best prices. Be sure to select the full price without Half Fare Travelcard. Saver tickets/passes are not exchangeable and not refundable.
Kind regards
Danhiel