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Some of the advantages of marrying early are: you take on responsibility early and avoid reckless lifestyle, you have your kids early and all of you will grow old together, you experience the joy of martial bliss early, etc. It's always very cute seeing a 55 years dad or mum already having a grand child. Sometimes, when you see them walking with their own grown up kids, you would think that they're siblings. Marrying early has lots of benefits if you marry the right person.

So that divorce and remarriage can be done earlier

I don't think so. If you find the right person then yes but there should be no pressure on when one gets married. If you are  ready for marriage whether you are 20 or 30 it doesn't make any difference.e