One of the many excuses I hear about people not dealing with their finances is that they have never been good with money or finances. One reason for this is that most people were not educated how to handle finances. This is why I feel it is very important to teach this in school.
Also, many times with married couples if one person is more inclined to dealing with the finances the other one will hand everything over to them. Even if decide to do it this way, it is also very important that the other person has