Is there a law that says you can not move a Mobile Home in Florida that is over 20 yrs old?

What makes you think there might be?

I could not find anything on the law books for the state
LSCMH Mobile Homes Laws
But there could be something in the DMV rules.

The home being safe to transport is the main issue. I know many that could not be moved because of axle issues or damage to home. The mover will inspect the home as to costs.

Have you called two or three movers and gotten estimates