I was reading some demographics about Russian women and I came across one that has been on my mind for a while now.

64% are younger than 30 years of age. Be very attentive with Russian women who are over thirty, and have never been married. These women have pragmatic minds. They have learned many lessons in life, and they may not be as simple as they might appear in the beginning.
I know what this says at face value but I'm wondering if someone could clarify these 'lessons in life'?