Is there a speling mistake here ?
Maybe the question is "What does a weak old kitten look like?"
If one wants to know what a kitten of any age looks like one would need to know the breed.
Also you could look at photos of the parents at the same age and draw conclusions as to what the offspring would look like.
I would go to a pet shot and see what they had in stock for comparison.
It seems like a pointless question