Answer:
That mostly depends on the personalities of the people involved. However, a younger woman with an older man will most likely work better than vice versa because older men are more towards the 'settling down' age and will probably be better committed to his partner. On the other hand, while an older woman is the same, a younger man is still 'active' searching for the right one. Most likely he will want someone closer to his own age, so that relationship mostly likely will not last. However, i stress that it does depend on the people's personalities. One thing to absolutley state though is that you should not date people old enough to be your grand parent. For instance, a 25 year old can date, say up to a 50 year old, but should not date a 75 year old. Follow? Hope this helped.
-f