Answer:
We can say all day long that age doesn't matter. However, that depends on your tribal structure and underlying subconscious and psychological ideas of what age actually means. I was taught based on certain structures it could be wise if the incoming wife is younger than the current wife or wives. An older wife coming in could be automatically considered an Elder, structurally meaning there are certain respects and acknowledgements given to anyone who is older than you. Again, this only applies in structures where this is given some level of social importance, but it could also have psychological implications even where structures such as this don't exist. There is no need to add on to any potential pre-existing jealousy or insecurities. Some may not think they have any such insecurities until they are suddenly faced with certain realities. It's good to minimize putting people in a situation which makes them more vulnerable to such realities in my opinion. Some may deal successfully without any consideration of these things, but that may not apply to the majority. Know yourself but also consider wisdom from those who are successfully doing this multi-generationally.
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