(spoiler you've been warned) hey so with the flash back with young mc and Chang when they first meet and they are talking about one punch man the anime first released in 2015 so if this game is set in 2022 or 2023 then that make them 9 in 2015 so then they'd be 16-17 in 2022/2023 but if this game has a little bit of time jump then it makes sense if not then it doesn't add up or the mc isn't a reliable story teller like deadpool then that works still loving the game either way tho