I've met 18 yr olds who didn't know how to use a tin opener!!
I also stayed with a friend at her parents for a couple of nights - after we had eaten the tea her Mum had cooked (seperately for us) she got up to leave and left the plates on the table!! She was 20+!!!! I remember saying there was no way I was going to leave them for her Mum to pick up and she didn't know what was wrong with that. In fairness to her she helped clean them away and said she'd just never thought about it because it had always been that way!
And..... you don't even want to get me onto some of the rich brats I met working with horses! There's nothing more ugly than some kid screaming they need a new pony because they hate the one they have.
I don't mind the kids (or teenagers) because they are usually alright if you tell them how it is, but the parents that spoil them go beyond what I can understand.