As a plan, if you are given the choice and not discarded, it appears to me dating in your forties seems to be the worst age for sucess.
Late teens appears to be the optimum age for totally throwing youself into love with no bagage, with fewer financial restrictions and an enthusiam for love existing. It's probably this age aswell where true attraction physically outweighs the fair exchanges that occur as you get older (money etc).
Twenties, a time of reproducing, securing finacials, security for children and wife by marriage. Practicalties high on the list with this age.
Forties for women tend to the rejected, discarded or the women who do the dumping in search of a better deal.
Incredibly hard to find a suitable partner at this age going into early fifties, the combination of sexual attraction and all of the other requirements needed often fall short of their ideals.
I've found that women by the age of 55, who are single tend to be much more realistic of their own situations.
By 55 and over you are probably more likely to find a companion, with fewer expectations of sex and desire, more accepting of compatibility and a greater pool of men who are availble through being widowed, the good men re-enter the market at this stage.
I find 40's early 50's men and women to be quite deluded in their expectations of partners and the quality of those available.
This is an overall view of the different life stages.
Exceptions occur.