My DD is 16. She doesn't socialise much with boys because she goes to an all-girls school. She's not had a boyfriend yet. Her head is full of getting good results at School, playing video games, listening to music and hanging out with her mates. She doesn't have a job, yet. She is soooo far off the marrying type. I was the same at her age. I didn't have a boyfriend until I was 19. Until then it was all, school, university, books, music, friends, discovery of the Internet (late 90s/early 2000s), going out. Though I did have a weekend job.
My mum, however, left school at 15 and went to work. She married at 21. My aunt married at 18. This was the 1960s, and a different time for women. Much less opportunity for one, and there were still some rules about needing a male guarantor to get a credit card or mortgage. Getting pregnant before marrying was shameful. My cousin came along very quickly after my aunt & uncle got married! (They were married for five decades)
So a lot has changed in the past 60-70 years. Women have a lot more rights, safeguards and opportunities now. Still not saying it's perfect though. I hope the new law will stop some families marrying off their daughters before they've completed their formal education. The old, "We're going on holiday to see the aunts and Grandma" and coming back with a husband with a spousal visa.
I know some young women are more mature than others but society isn't really set up for marriage at 16 anymore.