Most Armor that survived the medieval era would have had to been well taken care of, I.e. Most likely ceremonial and as such smaller then the norm for most armor of it's time. Ceremonial armor tends to be smaller because of cost.
I supposed the guy wearing the armor for ceremonial kind of stooped over for ceremony and stood tall for war.
Yeah, but the armor of Henry VIII is awfully small. Why I don't know, because the royal family could eat well if anyone could.
I think there may have been two races of men. Large (Viking & nobles size--larger fighters tended to survive) and small (peasant size)
wouldn't ceremonial armour also tend to be armour of the way high ups in the aristocracy, who wouldn't have had the armour comissioned until they were in their seat of power and were older? i've noticed that people tend to shrink as they get older, which may be a contributing factor.