"Do parents teach the same things to children of different ages?" "Do parents teach the same things to children of different ages?" What is the subject of "of different ages"?

An unsatisfactory product. I guess the unsatisfactory product is a sweater. I decided to buy a sweater coz you know, the weather became colder than before, so I went to shopping online, why did I chose it? Coz the price was cheaper. I found a black sweater which was really nice and the price was available, I was very happy and told the seller my weight and height. Then he gave me the size which I should wear, you know, in his mind. so I just clicked the mouse and paid the money. When I got it, I could not wait to wear it, but, after opening the package, I was so said because of a grey sweater. A grey, not black! What was worse, the size was not right too! How dare the seller! So sorry for that, I mixed your order with another one’s, it was the answer the seller gave me. Whatever, I made a bad review for him, got my money back and I will never ever shopping online again!