The society is used to being too reactionary rather than preventive. Why are so many lovers killing each other nowadays? Most relationships nowadays are not based on love; they are based on physiognomy, wealth, social status or personal interest. These are ephemeral factors that vanish with time and do not provide real satisfaction. Most of those relationships have no bond since love is a bond in spirit that is physically administered in friendship. The bond by an object vanishes as the object depreciates in value. People should start building relationships on love rather than artificial things that have no value.
Most marriages where the woman was older than the man or they were both almost the same age, ended up in divorce. It does not mean that the one with a considerable age disparity between the man and the woman always lasts eternally. Most women do not kill their husbands or boyfriends because they know that they can just walk away and let the courts rob him for them. Men do not have that luxury. Sorry guys!