Tann, that's cool. We're all glad that it meant that much to you. Hey, I **LOVED** the original CWWLLO. Al the killer DM, the vivid bad guys, the storytelling, etc.
Just keep it all in perspective. There is some undetermined period of years between that game and this one. If we ever decide to do a timeline, we'll have to hash that out, but this is meant to be a one shot game. It really, honestly, does not matter how old Maximus is now. Either way, there have been more than enough years for him to have adventured and gained his levels.
Remember, though, that the DM's word *is* law. If you absolutely want to be playing the exact same guy you were playing back then, but your timeline doesn't add up with the DM's... edit your timeline.
Change your age, change the events. Heck, this is a high magic world, maybe Maximus ended up in some alternate reality for a while where time flows differently.
Or, just hand wave it. It really doesn't matter. Again, nobody cares how old Arien is. No offense, but we also don't care hold old Maximus is.
Just focus on the game at hand.