It is perfectly normal. As the cat grows, so will his whiskers, because if you measure them across you will see they are as wide as the cat's body. This serves the purpose of when the cat is being pursued and wants to escape down a hole, it his whiskers don't fit down that hole, then the cat knows- it won't either. If you cat is ill the whiskers well shrivel up and break off- and when new whiskers grow often times they are different colors than the original set.
Your whisker lecture cheerfully brought to you by hissy- pack-rat of odd facts about cats!