I would love more attention to other ages than young adults. But I am not so sure if I want to buy one pack for each age. I would prefer a generations pack with something for every age.
As an example I look at the character values in parenthood. They go from toddler, to child to teen. I like them being usable in more than one age group. In a scenario with a seperate pack for each age this concept would be unlikely.
But what I want most is other age groups be included in 'regular' packs like bikes for children (DU) , magic for children (RoM) , parents being able to take their children along in a boat (IL) ,...