how old is rudeus greyrat

'Rudeus Greyrat' is the protagonist of 'Mushoku Tensei'. He's reborn into another world and so his age could be a bit confusing. By the end of the anime he's about 15 years old, but if we're considering his previous life, he's probably closer to 40.

You can tell by the end of his last reason 'Mushoku Tensei' that the life of young Rudeus Greyrat must have indeed been quite something. In the previous life, he died early. But now, given another chance and sent into a Different World, different universe is also an opportunity to be reborn. In this new life, when the story throws off and Events come to a halt, his physical age is roughly fifteen. But things are not so simple! That 25 years--about as much anyway, counting his last in Earth of reincarnation--it makes a total mental maturity of around 40.

The lead guy in 'Mushoku Tensei', 'Rudeus Greyrat', is a complicated character when it comes to age. He's around 15 in anime terms, but then there's his previous life, so I'd say he's almost 40.

Rudeus Greyrat's age in the "Mushoku Tensei" world is bad. When he was reborn in this world, he spent the first part of his life as a baby; but towards series' end at about age 15. On the other hand, please believe me when I say there is a different interpretation! When one thinks of all Rudeus' past memories and experiences, he must be mentally close to 40.