My son made this reservation for myself, daughter, and grandson (2to 64).
Fly by Night and Day
3 Decades of Experience working for United Airlines!
I will need to know what the error is. Perhaps you should contact United Reservations directly and ask them that question. There are fees for making changes and they can explain that to you. Call during off-peak times @ 1800UNITED1.
I'll try to make it easy.
Sounds like you are thinking there is a discount for seniors, call the reservation phone number and inquire if there is one for the travel plan. A lot of times there are no senior fares like in the past.