Who says your cousins want your life? Just because you think your life is great doesn't mean everyone else does. Not everyone wants the same things. Your feeling sorry for people who choose paths different from yours is pretty arrogant, honestly.I think that it is becoming less and less common and for that reason, I am happy. The human brain doesn't mature until age 25 and I surely think there is so much to experience in life, especially when you're still very young. I do not see the rush for marriage. As for myself, I am 22 (almost 23 in 3 months) and I do not plan on getting married/pregnant until my thirties. In Europe (when I lived abroad) this was completely normal. I just noticed when I moved back Americans tend to rush into things without thinking clearly about the commitment and work it takes to make a marriage work. Especially when you're still developing and changing as a person. I can even say now that I am NOT the same person I was when I was 21. I used to stay home all the time and not do much. Now I'm going to Vegas, getting drunk and dancing at clubs or bars, seeing live bands, eating out with my friends and enjoying life. I feel like EVERYONE male and female should get that craziness out in their twenties so they're not sitting at home in their thirties or forties with some regrets since they never experienced youth.
I have two cousins that have married in their early twenties (21 and 22). Do I feel bad for them? Yes. Because I know they will never live the life I have or have the opp. that I have. Getting married is such a huge commitment. I still need to travel and see most of the world before I get married.
Not everyone finds what you label as "craziness" appealing or the least bit enticing. So why would there be regrets?
Not to mention that for people who are into that, there's nothing that says they can't do all of those things when married. Not all people start having babies the moment they're married. If anything, with combined finances, it's possible for some people to do things they wouldn't have been able to afford on their own.