Entire generations of women have been told that it's not OK to have children unless you're in a stable relationship and can afford them, which requires waiting.
Are you really going to run the "we need more eighteen year olds to be welfare mothers" campaign?
Humans are unusual: we live long enough to be grandparents. It is suspected that this is because we evolved for them to be an important part of raising the next generation.
Working with the grain on this rather than against it, it wouldn't matter that new parents were kinda noobs at adult life, so long as they were actually adults.
Yes, I read that some scientists believe that the reason women go through menopause and can longer have kids, and also lose their ability to attract male attention (relative to younger) is so they can focus on grand kids
The problem is that human being used to live in family clans, and the western state institutions deliberately pushed the nuclear family as family clans were powerful.
And then as cities became popular for jobs, kids moved away from family.
And presently the parents buy a house and raise kids, but with ever increasing house prices and gentrification many can't afford to then live down the street from their parents.
Me and the wife had our only child past the age of 40. Only then our finances were in order that we could properly raise a child, to our own acceptable definition of "properly".
Life sucks in the best of times. I was not going to bring a human to the world so she would suffer, replacement levels be damned.
If I was unable to give my daughter a comfortable life, I would rather have no child.
I think many people would agree with this sentiment. If we want more people to have children in early adulthood, we need a major social upheaval so that people can achieve financial stability earlier in life.
Most people that seem overly concerned with fertility and population replacement, also happen to consistently vote against any policy that could nudge things in a direction where people would be able to achieve financial stability earlier in life.
Kids don't care about a comfortable life, as long as they are loved and supported.
I've worked with Devs in the west who came from tiny rural villages in India, and with love and support got into the leading universities in India and did well.
Lots of middle class western kids get screwed up, despite 'having everything'.
Money, a bedroom not shared with a sibling and so on do not matter to a child.
Entire generations of women have been told that it is ok to delay having children into late 30s and early 40s.
The science clearly shows that both fertility rate and increase of an unhealthy baby increase with age.
There should be 'embarassing campaigns' to revert this.