I'm in my mid-50s. The generation older than me - my aunts and uncles - generally were in school until grade 8 and were out of the house and working by 16. My mother had her older sister as her teacher.
24 is not a child. You can vote drive, drive, drink, marry sign legal documents etc. And at least for women fertility begins to decline at 32. If you mean you will continue to grow as a person and develop new interests that hopefully never goes away. I went to grad school and was in academia for over a decade after my PhD. I have made two major shifts in my career since then. Old people still feel like they are in their twenties or early thirties mentally, we joke about it all the time. So congratulations, this is it.
at least for women fertility begins to decline at 32.
That's a little bit of a yikes there, buddy.
Edit: and additional "yikes" for all of the people that don't see the problem with assigning a value to women based on how fertile they may or may not be.
Edit 2: tHe QuAnTiTy Of EgGs! Because women only exist to get pregnant.
They said nothing about the value of a woman being tied to fertility, that came out of mind..
As for the decline in fertility statement, that has been scientifically proven for decades and assumed for centuries. Women are born with a set amount of eggs, they typically go through at least one per ovulation cycle, they start reaching the end in their 30s and risks of birth defects start increasing in their 30s
The question was about marriage. There are two reasons that I see people get married. For young people it's about starting a family. However you and I feel about it personally, legal structures that are in place just make it easier when you're married. The other reason is for older people. Pensions and estate planning is easier for married couples. Again, I have opinions about it but it remains a plain fact.