I think product condition is just that, product condition. The product not having warranty doesn't make the product condition bad. That's why warranty is asked separately.
If I have a laptop which has zeeo dents or scratches and looks like new, then I'll put 5/5 even if it's 3 years old. On the other hand, if there's issue with Touchpad/keyboard or visible ageing, I'd rate it lower depending on the extent of the problem. I wouldn't lower the rating simply because the product is old.
In fact, I'd say that would defeat the purpose of this rating. You already know the age and warranty status of the product. The whole idea of this condition question is to know if there are any known issues with the product. If the condition was correlated with age and warranty status, there'd be no point in asking for it since those questions are anyway there.