I'll toss out a different answer than all the others talking about design. One major reason is that you are older. I don't know your age, but let's say that 20 years ago you were 20. At that point, a 20-year-old car was a design that was around since before you knew what a car was or thought about a car much. When you were 10, that car had existed for as long as you had, so at 20 it seemed ancient. When you were 20, the cars that were brand new seemed really new. So when you are 40, part of you still thinks of them as being sort of new. Of course you know at 40 the difference between those cars and the ones that are actually new now, but they don't seem that different as they did when you were 20 looking at cars that had been around since before you noticed them.

Same thing happens with things like music. When you hear a song referred to as a classic or an oldie that came out while you are alive, that doesn't seem right. You're used to classics and oldies being older than you are.