Yes, I use low level adventure sites for my high level games on a very regular basis.
With high level gaming, I like to think BIG! The entire multiverse is the "dungeon," teleport/wind walk/plane shift is the "hallway," the target location is the "room," and if that location happens to be secured against direct entry, then the surrounding structure and wards is the "walls" & "door".
Each "dungeon room" for a 20th level party could have been the entire "dungeon" for a lower level party. And each relevant adventure site could be spread out enormous distances, including between planes, but it's just a Gate and a Teleport away.
This is how I don't care that a high level party can move through walls with ease and avoid entire sections to get the toy surprise at the bottom of the cereal box. This is how high level divinations and movement magics makes the game instead of breaks the game. This is just how high level parties work.
It's also fun to use lower level adventures when a high level PC needs to make a solo quest. When the archmage defeats the hobgoblin leader of the goblin army in ritual hand-to-hand combat to take command of the army, that's hella fun.
