they could just start a family but the main oldschool back-in-days reason to marry is to commit to each other or make commitments but then those are all corrupted in modern day.. commitments are not held and people have divorce and such so..in this nowaday world marriage is only treasured by certain rightous people/couples no reasons for some except to "announce".
They want their FAMILY to grow as well as fulfil their needs (No need to mention needs here IMO) DON.
Marriage is a Open prostitution I am not telling this, Most of my friends(married) are use to say like this.
Today marriage is not so in fashion...but there are some who are still believing in it...I'm one of them, because I'm happy having a wife and a family with her
To have a family without being frowned upon in some areas depending on your age. Also, to demonstrate to their partner how far they will go with the relationship, that it isn't just a walk in the park kinda thing.
Because after a certain age you are not likely to find a girlfriend so its better to book the girl for lifetime