Why is it important to wait till marriage?

Honestly everyone says it and it's really annoying because they bring religion into it but then don't even know if you are religious. Plus I've noticed people forcing it like ig maybe wait for a relationship but marriage all the people I've seen who wait till marriage get married at 19. So I don't know I'm not trying to be rude but I just don't get why it's so important to waiting for a piece of paper. Just wanted to say tho if you are waiting/waited till marriage that's fine do whatever but yea I just wanna know why it was so important but not from a religious perspective even if u did it because of religion try to explain without bring up religion please. Hopefully that made sense
Why is it important to wait till marriage?
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