I'm not trying to tell you anything about your cousins. You initially framed the issue as your cousins being regretful that they married young because they couldn't have your life. So no, it doesn't invalidate my point about you making assumptions about people who choose to get married young. Basically, what you revealed afterwards about them just points to the real problem with them being married young, not that marrying young itself is the problem.
And of course marriage entails more than just being in love. My point is why do you assume that people who decide to do it young don't think about these things? Or that they do it for the wrong reasons? You paint with a VERY wide brush.
Also, I'm older than you and I'm never going to want to party. It's just not something that's ever going to be an appealing lifestyle to me. Ever. You can party away. I promise I won't feel deprived.