Here the number of available partners does show a concave shape.
There are also alternative social theories for age differences in relationships as well as suggested reasons for 'alternative' age-hypogamous relationships.
(The genetics of sex ratio are a very interesting story, which I will cover at some point).
However, men are stupid, risk-taking fools whose bodies tend to degenerate faster, thus women tend to live, on average, six years longer than men.
A group of adventurers travel across the Land of Centra on a quest to kill the Evil Ruler of Avalon!
Led by the amnesiac cleric Captain Walrus, these heroes do not know there are other plans for them in store...