Women hit geriatric pregnancy at age 35 after that and even before that it is even harder to have children

So it's very easily to express that they most likely won't be having children or if they do have children it might just be one

Also people date a lot longer than they should before they get married are even have children

People's professional careers may not truly begin until their mid 30s and by that time they won't be many incentives

For them to have kids

It's a save bet that if somebody in their mid-30s particularly if they are a woman chances are they'll never have kids

Therefore they won't be future taxpayers or a generation to replace their parents

People are not plants they don't just appear