When crafting, it shows components of a recipe with a green tint, for food or other relavant recipes it could show yellow for (old).
At the moment it is hard to pass much info from components to recipe, so it is generally avoided.
It would be confusing if different batch sizes showed different component age. Though maybe less confusing than what happens now.
Well wishful thinking for now, I hate having to scan all my food pile for rotten and old before I do cooking. One of these days I really should motivate myself to look into coding so I can try my hand at adding to this awesome game. I never know where or how to start though.