That’s too simplistic. The situation depends on multiple parameters, including rate of children (future workers) being added, rate of automation advancement, energy supplies, and changes in length of non productive years due to technological advances.
It is obviously possible for old people to live too long so as to become a net cost to society, which means the resources used to keep them alive take from resources that could be spent elsewhere (such as on the young). In fact, that is the top political problem in almost all modern democracies, even though it is not stated that plainly.
It is obviously possible for old people to live too long so as to become a net cost to society, which means the resources used to keep them alive take from resources that could be spent elsewhere (such as on the young). In fact, that is the top political problem in almost all modern democracies, even though it is not stated that plainly.