Again, that is an opinion, but the ranking are actually based on points that are based on strength of field, with more points going to the most recent 13 tournaments since that is a better indication of how well said player is doing recently.
Oh and BTW, Michelle Wie won the US Amateur Links tourney at 13 YO 2 years ago, and she was the youngest player to do so. And before you undermine that remember those are not just young kids but some damn good college girls who play there as well. Including I believe that one included Paula Creamer, Pressell and a few of the other rising LPGA stars.