Wow! Now that is a good idea!
Password-protected volume limit controls
To help prevent hearing loss that may occur when listening to audio at high volume over long periods of time through earphones, all currently available iPod models include volume limit controls allowing you to easily set the maximum listening volume. You can protect the maximum volume with a password, so it cannot be changed without permission.
Hat tip to my excellent anonymous pal who happens to be an old high school sweet heart!
Thanks Mitch! XOX