We got questioned. No, actually, dd2 got "conversed with." More than once, at more than one park. She was in a stroller, and is TINY (12-18 month clothes on that trip, she turned 3 on the trip). She was just as likely to answer ANYTHING but 2, however when they conversed and then asked her how old she was, she blurted out 2 every time. Except on her birthday, when she proudly told them "I'm 3 today! It's my birthday!"
And yes, they convinced a family at AK one day to buy a ticket for their "2 yr old" who was quite tall. They were told that they could file for reimbursement later.