And the stats of an hypotethical 1st level vanilla sword & shield fighter with 15 CON:
Damage 1d10+1/+2 piercing, 25 HP, 3 Armor
Backed up by a magic missle-blasting wizard for 2d4 damage/ignores armor, that dragon eventually is going to fall—even if it's going to inflict A LOT of damage. Still we're talking about a badass element-breathing giant ancient chromatic dragon. Imagine just what they are going to do to this poor dragon at level 10. That's when comes in handy the apocalypse dragon:
Bite (2d10·b+9 damage 4 piercing) 26 HP 5 Armor
And here we're talking about the Alduin from Skyrim, the Jörmungandr from norse mythology whose poison will kill Thor during the Ragnarok.
Damn, this game it's so epic I wish I could play 7 times a week.
So, all this just to explain that: 10 levels in DW are relatively the same thing of the 20 (or 30) levels in D&D. It's just a different* pacing to reach the same goals.
*read: way more funny
Sorry but I'm lost here.
What are you saying, low level characters are too powerful for even the most ancient of dragons?
Is there advice in the book for using standard d&d modules?