New Birthday New Bracket

Last week I went from the oldest of my bracket to the youngest.  Otherwise I turned an age that has no legal and little social significance.  Will the change affect where I finish in races?  My best guess is yes, but in a bad way.  For half marathons and longer, I will probably finish even lower on a percentage basis since the folks still running distance in this bracket are for the most part actually good, rather than merely persistent.  Up side?  I am 5 minutes closer to qualifying for Boston!