I'm sure they have rules about children being in the PPC on the Coast Starlight during the Wine and Cheese Tasting, but the two times we rode in '09, they were not enforced. When we were heading north, a couple with two young children, around 3 or 4 years and 5 or 6 years were allowed to sit with their parents at the booth throughout the tasting. They were pretty bored. At one point the older one went down to the theater, but didn't stay long. The younger one whined and cried through the last half. On the southbound trip, there were some teenagers who wanted to finish their board game, and the Attendant gave them permission to stay 'as long as you don't disturb the other passengers'.