Monsterverse Godzilla

well kind of hard to determine kaiju growth periods, but I would imagine that he would at least be hundreds if not thousands of years old. Since the monsterverse suggested there was once a thriving population of Godzillas point in time and it is suggested that his kind ruled during the Permian...possibly the late Permian or even the early Triassic which was 251 million years ago.

I'd say a few million.

Godzilla: Awakening shows that he survived the Permian extinction over 250 million years ago, so he's probably well over 250 million years old. Granted many people, including myself, dispute the canon status of Awakening, but so far there's been nothing to contradict that origin for Godzilla and it's the best idea we have of his age at the moment. It's always possible Godzilla's origin could be retconned or examined in further depth in the next two films.

Hopefully, Its hard for me to stretch my suspend of disbelief for a single individual Godzilla could live through all those millions of years. I would say Monsterverse Godzilla is 2 million years old at most (would be a nice reference to Gojira 1954) if not younger.

I don't find Godzilla being 250 million+ years old that much harder to believe than Godzilla existing at all. I don't understand why people have a problem accepting it. He was alive 250 million years ago, and after the Permian extinction simply entered a long state of hibernation and suspended animation deep underwater, only becoming active for very brief periods over the ensuing eons. A 250 million-year old giant prehistoric radioactive reptile is no less realistic than a 2 million-year old giant prehistoric radioactive reptile.

Well I would rather that Godzilla be around 2,000 years old.