There has been a spate of businesses sending clear signals to children that kids are neither appreciated nor welcome on their premises.
A few stores, airlines, movie theaters have implemented no-kids zones for various times, sections or days. Perhaps the best-known example is an eatery in Pennsylvania that has forbidden toddlers (5 and under) from the restaurant.
Some have protested, claiming that parents and kids should not be singled out as troublemakers, and argue that it's a form of discrimination. Not really, though; people aren't being banned for gender, sexual orientation or race issues. That would be discrimination. If a business seeks to cater to an older crowd, adults, teens, singles, etc., it has a right to set an age limit that assures an ambience and experience that its paying customers want.