几个论点：
1.Young adults are not financially prepared to hasten into marriage.The economic burden will likely put a strain onto the couple's relationship,leading possibly to breaches,or worse,separation.
2.Young adults have not attained the level of maturity to raise children.They are often unaware of the responsibilities and sacrifices that one needs to make in order to start a family of one's own.
3.Statistics are good indicators for the instability and short life spans of premature marriages.
提供这三条作为思路,其他的自己可以补充.