The second one could be grammatical, depending on its intended meaning. That is, syntax isn't the problem here, it's semantics. Say, in an alternate universe where children age rapidly by the hour:
#2 children ageing [from] 6 to 10 hours will require ...
=> from is hidden
Both of these are awkward:
#3 children of ages arranged from 6 to 10
=> ages that are arranged
#4 children of ages arranging from 6 to 10
=> that are arranged
The problem, children of ages.