Those Giant Kron don't look a day over 30! It is impolite to ask a Giant Kron its age. Always comment on how young they look and how mature they act and you can't go wrong.
...Oh, and don't even think about asking their weight!
Also, it has been my experience that Giant Kron may steal your french fries even after they have made a big fuss about how they are watching their weight, and despite recommending they get their own; which they will adamantly decline because they ordered "more than enough, thanks."
Thanks, Z.