Anyhow, DS has begun noticing the concept of "young" and "old", and how adults and "older" than children. Here is part of a conversation between him and me recently.
DS: Mummy, are you old?
Me: What do you think? Do I look old?
DS: (seriously and surely) Yes.
Following the above exchange, I proceeded to explain to him that I was relatively "young" in comparison to someone who was 80 years old, for instance. I don't know if he understood what I was trying to tell him, but the moral of the story is - don't ask a 4 year old if he thought you look young (or old!). Anyone taller than him by 1 inch and not in preschool is considered "old"! Haha.