Man Chero,
where do you live? I have several pipes that are in their 50's and none cracked, they have traveld the world with me, in all types of climates but I have never seen any cracks like that. I have one that my wife bought me two years ago brand new with lighter and stamper that cracked right on the grain, but that had nothing to do with age it was poor workmanship, un fortunately I could not return it because we had left germany already. But other than that I never seen a pipe crack like that.
Yuri