Le voyage is correct. See link - not all words ending in -age are masculine, but many are. «-age» is not a 'feminine' adjectival ending.  There is no ending that is absolutely 100% predictive of the noun gender as far as I am aware.

https://progress.lawlessfrench.com/revision/grammar/how-to-identify-gender-by-some-word-endings

(PS - Asking 'why' to the gender of French nouns is mostly an exercise in frustration!  It is mostly a matter of just asking and learning 'what/which' gender as you go. Some nouns of same spelling differ in meaning by gender).

Thank you that was actually my mistake I wrote it down wrong in my notes.

We have all been there! And, I should modify my answer - after writing it I recalled a reference on FrenchQuiz (Twitter - Laura Lawless) to «-isme» words all being masculine

 Here is a link to the supporting article:  https://www.lawlessfrench.com/grammar/masculine-noun-endings/?fbclid=IwAR1F1JjhhUdaIpuv_OqCMtCm7InhfEIzNe4krvDYT6CK5gWaScBioczLICU

Just proves that there is an exception to every rule, but not every exception gets another exception ! Unless someone can find an exception that disproves this, at least there is a small area of certainty here.