We are talking reproduction here...and yes it is very prevalent in human mating also
You can see many younger sexy women with older partners. And of course the older guy is quite thrilled to have her younger woman on his arm and in his bed.
But bother parties usually have there reason for picking younger in the man's case ..and for the woman to pick older.
From both points it has to do with reproducing the species.
A young woman is more fertal and healthiest to have children..Where as the woman picking the older man .Usually they are more stable in there employment,higher income perhaps self employed and confident , have experience in surviving and have the means to provide for the wilfirst and family. Those things are the most important to me women and is why many relation fail. .Compared to the younger guys who still does not know what he wants in life or is not mature enough to be able to look after himself let lone a wife and children .
There is a lot to each said about being older and if you find he right young women they can keep you feeling ND bering younger then your age . After all there is that great nsentive of sex for us old horney buggers.