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There is no need to have a workshop to show that fertility falls with age. Nothing works so well as it gets older. One has only to look at the progression of one's teeth, a very visible manifestation of the process of ageing, to make one wonder what goes on inside the reproductive system!
Probably there is no evolutionary disadvantage to having reduced fertility with age because by the time that there is a significant reduction in fecundity the genetic pool which will be added to subsequent generations has already been added. In biological terms, there may be a positive advantage in reduced fertility in older women, since the human infant is dependent on its parents for such a relatively long time and there may be an advantage in the mother surviving for 7, 8, 9 or 10 years after her youngest child is born. In looking for a teleological explanation of declining fertility with age and of a menopause, this is one possible explanation.