Well yes, it could happen to you! A friend predicted I would have twins (she had triplets herself) - and she was right, annoyingly! I also remember saying to dh that if he agreed to no 3, he had to be prepared for 4 because "it could be twins" - ha!
I thin that the older you get the more likely non-id twins are. Identical twins are a fluke that can happen to anyone at any time.