We're doing a buffet lunch for our reception, and have invited several families with children of various ages. Our venue charges reduced amounts for children based on age (half price for 6-11, kids 5 and under are free). We know where most of the children fall in the age ranges, but there are some that we don't know their ages, and so we need to ask their parents how old they are.
Is there a polite way to do this? I don't want to say out of the blue "How old exactly is little Jasper? We need to know to give the venue an accurate count of children coming." because it's not like there will be a kid's meal option, it's all the same buffet, we're just being charged differently. I'm pretty sure most of these people would be fine with us not wanting to pay more than we have to, but it still seems rude/awkward to ask solely so we can get the discounted pricing.
I'd appreciate any suggestions on how to approach this issue. Thanks!