As one ages one seeks companionship and these relationships fulfil that need.Generally couples in these relationships are more understanding towards each other and this helps in the sexual aspect also.There is a lot of give and take which happens without the conflict that exists in near age couples where there is competition also between the spouses.Meeting midway is a lot easier,which leads to success in the relationship.
There is a definite advantage here, one of the partners being young might be agressive whereas the other being older might be softer. This eliminates the chances of prolonged fights or misunderstandings. But not sure of how the sexual needs might differ between them
