know if it's the "right" person after 2 1/2 weeks. No, when you're a 27 y.o. RM and a 23 year old college graduate is the "right" person, don't turn it down because you always wanted to scuba dive every one of the top 100 best scuba sites in the world.
Don't talk about people 30-90 years ago that made it work. It's not the same today. 50 years ago girls were ready to cook, clean, have babies and make clothes by the time they were 18. Nowadays, girls are still worried about tan lines and the latest Twilight movie sequel. Guys are worse, most 18 year old guys had the mindset of getting a job and providing for a family 50 years ago, now you can't get a 21 year old RM out from in front of a video game console. How in the world does an 18 year old know what she wants in a spouse. $10 says he's her first real boyfriend.
"The NCHS study of women, for example, shows that age makes a difference. Women marrying before age 20 face a higher risk for divorce. Marriages that have already lasted for a number of years are less likely to end in divorce. If your parents did not divorce, your chances are better than if you came from a broken home. Couples who live together before marriage are more likely to divorce."
http://www.truthorfiction.com/rumors/d/divorce.htm