There is no correlation between age and basic understanding between husband and wife. Those who are now sixty five years old, have wives who are around ten years younger. Yet, they have gone though a series of relationships that are a huge mix of the good and the bad.. Yet, they have had tolerance of ambiguity, ability to sacrifice their own personal interest in terms of the larger family interest and so on.
However, times have changed now and it is not wise to have to have a big difference between the age of the man and the woman, even in arranged marriages. This is more so, as the times are characterized by the presence of the rat race, huge office politics, eating out as a matter of routine and so on. If, for example, the age group is such that the age difference is three or four years, and both of them are from the same industry like IT, they will naturally develop a deep understanding of each other and have family relationships that are healthy. These may not match those of their parents, but since both of them are aware of the new realities, they tend to easily adjust.
For instance, there is a thriving service sector in most towns, and in the big cities, where the so called "side dishes" come from hotels. So, either the husband or the wife gets to spend just about twenty minutes on making such dish and the rest comes from outside within twenty minutes. The time saved is spent on caring and sharing of a tall order.
So, while there is no correlation ship between age and mutual understanding, in the modern times, it is always fine if the age group is just four or five. It is always a question of adapting to modern times. I guess this adapting to modern times is now happening very fast now.