It happens, but it isn't the norm.
Where you have society, you have a vast spectrum of people and lifestyles. We can all find examples to match our beliefs.
The younger generation working is paying for the older ones like me. Pensions come from taxes. Stephen Fry produces a good graph in this video.
(warning it does also contain anti EU stuff) You can find it 2 mins 53.
I know of several families with five or six children. All the fathers are present, working, and most of the mothers also work part-time. One mother I know has qualified as a child minder, so looks after others' children as well as her own.
They contribute to the food bank in Whitehawk which is...