Had time to get ready perhaps? We found out we were expecting twins nine weeks into our second pregnancy, and we needed all nine months to prepare ourselves mentally. Unfortunately we only had 7.5 months, and it took us years to catch up.
One book we read included the statement that the occurrence of multiples takes off astronomically at the age of 35, perhaps showing Mother Nature has a sense of urgency, but it also drops again at 41 - showing she also has a sense of humor.
We would never wish twins on even our worst enemies, but we would never chose to be withour ours - we are blessed to have such a gift.
The article points out the extreme narcissism of all of these people. Can't get pregnant? They demand it. More than they want? "Reduce" the pregnancy. One woman says having one child is a step up from having a goldfish. It's only a child if the parents want it. If they don't, just flush it, like a goldfish.