I think for inhalers this should be age related.
10 yrs onwards seems reasonable to me.
however, for younger kids this idea of school kids having own inhalers does bring problems.
1. teachers in class have no idea how many times an asthmatic child has used their inhaler that day,so have no idea a big asthma attack is on horizon.
2. inhalers in pockets/bags can release the gas and so med is not being delievered.(or its empty.)
3. child is not using inhaler correctly possibly without a spacer so not getting correct amount of inhaled meds.
4. if parents leave it to the kids to self medicate, and so do teachers, who is checking the child's lung function?