We have finally entered the age of teenagers not knowing what coins are

Me and my GF went to an ice cream shop which shall remain unnamed in Walnut Creek today, and there was a young girl working there. Maybe 16-18 years old. We ordered our ice cream and set a $20 and some change on the counter to pay with cash, while she was making the sundae. She returned to the counter and seemed confused, probably wondering why I didn't use the tap to pay. Then she noticed the cash on the counter, and asked "oh...is this from you?" as if she was surprised somebody actually paid using cash. "Yes" I replied, and she picked it up and I could see she was still confused. As she was looking at the coins like some alien artifact, she paused and asked me sheepishly "a dime...that's 5 cents right?" There it is folks. We've finally done it. Our kids don't know what coins are.