There are so many factors. It depends on what your goals are. If you're a 30 year old man and want to have children, and the woman is 28, it works great. You need to talk about where you want to be financially and if it is okay to have a child now. It really depends on the goals that the people have. If they want to travel for a couple of years and then come back, they will need to talk about that beforehand and have an idea about when they want to have children. Some people are happy getting pregnant six months before they get married while some prefer waiting 10 years. It really depends on the couple.