I think it's dependent on the couple.
My brother is 50 , his wife of 3 years is 30.
They make a wonderful couple, she is an old soul and he is still the same as when he was 21!
He has a child from a previous marriage, she does not want children. They now work together. They are always at a concert, or travelling. I get tired just looking at their schedule!!
They discussed everything important before marriage and have very similar views. They are clearly in love and despite the age gap you would be hard pushed to find a happier couple whatever age.
My daughter is 35 and her husband is 47. They have been married 8 years and seem very happy.
So I would say ....why not?