as someone who got married at 21, I can honestly say it's the decision I'm most happy about in my life so far.

However, we had been together for over 7 years by that point and I'd be very wary of advocating getting married young to everyone, as I know at least here in the UK there seem to be quite a few teenage/early-twenties couples who decide to get married after a few months to a year, and end up divorced 6 months later. The facts in this article could be also taken as very misleading, especially considering that the happiness survey they took made no mention of age.