A common mistake

Sunday 14th of August 22, I had a date with a friend on the Hong Kong Island so I got on the west rail at my home station. The train was full of people so there's no empty seats available for an elderly like myself. Two young children were on the priority seats jumping and bouncing, their mother was standing on the side. I observed for 5 minutes. I then talked to the mother saying that my legs are poor and cannot stand too long. I pointed to the priority seat picture that the priority seats are not meant for children. She told her children to give me the seat. That's the first time I exercised a senior citizen's right.