Please help me analyze this sentence, I don't quite understand what he means.

This is the English translation of "you are old if you are not crazy". The key to English-Chinese translation and Chinese-English translation lies in whether the core content is consistent.

It's also ... structure, which means "too" ... to ... ". The literal meaning of this sentence is "youth is too short for us to do anything or become anyone." Only madness, only madness, can temporarily retain youth ",so it translates into" we are old if we are not crazy ",which means grasping the tail of youth, madness! ! !

It can also be translated into English, because youth is too short, so don't do anything else, just be crazy!

I hope it will help you understand this sentence!