About this image

There is something about my companions that makes everyone unique and it seams like it has to do with their age.
The oldest can take orders the best, while the younger ones often don't react.
The younger they are, the most likely they can start to cry.
The oldest never cried.
The oldest can run down slopes safely like me (I saw him using my trick), while the younger always just stumble down and fall unconscious.
The oldest does yawn more often than the younger.
Is it really possible that the age-slider does more than just changing the look?