I think you may have the wrong understanding of what we mean by "prime".Originally posted by: Mythos10101
In episode 55, while Kakashi is climbing the cliffs, his exact words are "This rock climbing training is tougher than the last time...Damn, my body has weakened." So he is not in his prime...Your question has been answered...No, Kakashi is not in his prime...
We use this word to say the age at which a person may have his full potential in strength, intelligence and so forth. A person may reach that age and through lack of training not meet his full potential. I remember the scene you described, Kakashi had trouble climbing but it could for various reasons, maybe he had not done intense training for a while. From what I understand a males prime is between the ages of 25-35. We really don't know if Kakashi is past his prime or whether he has yet to reach it. I guess we should wait and see.