Quality of relationships based on age, nationality, education?

It's in the drive of the person. Higher educated "significant others" tend to be that way because they were motivated to accomplish such things. It's very typical to see non-Americans who strive for something greater because they wanted to leave their country and need success elsewhere. Ex-military or soldiers/airmen/marines/seamen still in the military also share a drive for success because of training. (That is assuming the training held and they actually wanted to be made efficient)