The society with too many under 15s need more schools to be able to educate them. There should be efficient and laborious teachers. There should be provisions for items necessary for a child’s amusement, like toys. Children are prone to diseases; facilities for hospitals should be improved in such a society.

In a society with too few under 15s will have more and more mature people. Pension schemes will work there fruitfully. There may be the need for wheelchairs. Labour supply will be easier. These people will also need hospitals.