I am 4 years older than my husband. Although, you would never know it to look at us.
I can definitely tell you my husband was not looking for a mother in me......I am the complete opposite of his mother! LOL!
However, every woman he has been involved with looks, sounds like, and acts like his mother. I have taken that to be he is looking for someone to validate what he is doing.
His mother, while not one to give a lot of vocal support to her sons, also never thought they did anything wrong. So, my h could go find these women knowing they would also support and love him and let him know whatever he does in life is just fine and dandy!
And that just makes me want to barf!!
I think you are way off to even consider that men who marry a woman who is older than them is looking for a replacement mother or a mother figure in their lives. I think they just fell in love with someone who happens to be older than them!