Magnetic fields drop off as the cube of the distance, because the molecules further away will experience much less force you will need a much larger magnet anyway.

That's not 'somewhat' stronger, that's a lot stronger.

If a mouse is 25 mm high and you would want to levitate something the size of a human of say 1.75 m high with the same density as a mouse then the required magnet would have to be roughly (8^6)/2 times as strong for the same effect.

Then you still have to take into account the size difference at the base of the field, figure another factor of about 10 or so for that.

If you take the 'easier' approach and levitate a person while laying down (probably a wise thing) then the required magnet strength would be smaller, but still not that much smaller, you now have a vastly large surface area to work with ~40 times as large, (30,000 square cm opposed to 75 square cm), and the height is still 10 times as much so figure another 8^3 as much for that.