Do all four phrases mean exactly the same when filled in the following example?
Children in the ____ from 5 to 10 were quickly cured.
To me there's no difference at all. What do you think?
Do all four phrases mean exactly the same when filled in the following example?
Children in the ____ from 5 to 10 were quickly cured.
To me there's no difference at all. What do you think?
These are valid phrases and mean the same.
Ngram shows age group to be the most prevalent followed by age range, age bracket, and then age band. The first three are common phrases and are found in dictionaries; the last one is not found in major dictionaries. The choice is yours.