Can I add, as a society what do we know consider to be 'grown up'
I few generations ago getting married and having children in your early twenties would be the norm and in line with your peers (perhaps mimicking the group around you) my husbands parents were married at 20 and 18 in the late 70's
I was married at 20 in 2006 (very unusual for an agnostic couple at the time) husband also 20
His older siblings were married fairly young I think he was keen to emulate
I could not imagine my DD married at 20!
Having babies is not directly related to marriage but their is little social pressure to 'settle down' there is also IMO an assumption that over 25 is grown but still young and figuring it out.
I think A LOT of previous generations were immature and still 'figuring it out' in their 20's but the norm was to do it anyway (possibly with help from older generations) but also watching their peers do it and (possibly) pretending to have it all together.
We are going through a cultural phase (on tv etc) of speaking our truth. Be it 'why mummy drinks' or 'motherhood' or even a lot of 20 somethings saying out loud 'I'm too young to have kids, I don't have my shit together'
How many average 20 somethings do have their shit together, housing is a nightmare, job security is low and they don't feel like adults yet and we don't treat the twenty somethings as adults do we??