Share 'Distance degradation with age?'

Does anyone know how throwing distance degrades with age?  The reason this came up was because I was looking at the results of the PDGA long drive contest, and noticed that the winner of the women's grandmaster long drive was 189 feet.  The women's was over 400 feet.  There were no masters in the contest.  So, does it seem reasonable to say that women would lose over 200 feet in 20 years? There w…