And 2002 wasn't 'a completely different world then,' as someone said further back. It was only 20 years ago.
Are you kidding?
You may as well say 1930s Britain was the same as 1950s.
And 1950s was the same as 1970s.
Of course there were massive economic and societal changes between those times in terms of economics, womens place in the world, wars and recessions, economics, development of the pill etc. all of which massively affected relationships.
I get that it might seem to you like nothing has changed since 2000 because you've lived through it and the changes have been gradual, but there have been huge economic changes since then, which affect relationships and lives: house prices, massive recession, inflation, brexit, pandemic, social media, technology, online dating, womens equality.
That's why OP is asking about people getting married young right now!