Marriage
Kaizyn: When you look at the entire human population, you will see very different statistics for marriage and divorce.  Now many people who marry young will get divorced (at least in the United States), but then so will many who wait until later in life to marry.  Your sample there is too small to draw any meaningful conclusions.As marriage relates to a startup or any entrepreneurship, the fact is that you only have so many hours in a day.  Most spouses like their mate enough to want to spend some nontrivial amount of time with them.  When this time commitment cannot be fulfilled due to wanting to the entrepreneur working insane hours in the basement or whatever else, it will put strain on that relationship.  In short, having good personal relationships requires a major time commitment.  Any startup or other entrepreneurial project also requires a significant time commitment.  Depending on how these are managed or not, it can lead to a successful startup and failed relationship or vice versa.  If you take greater care, then you can make both work but that won't be easy.  After all, nothing worthwhile is particularly easy.