You can always take the young version of the peep./ Take it into Photoshop or Paintshop (whichever you use)/ Select the hair with a selection feather of 3 to 5. / Gray the hair just a bit. Select the whole head row. / Copy and paste it over the old version of the peep. / Line it up with the existing heads. / Select the existing head row and delete it. THEN YOU'LL LIKE THE OLD VERSION OF YOUR PEEP MUCH BETTER.

You can also exchange/or customize the heads you don't like. Just make sure whatever you do to the young heads you also do to the old and vise versa. Don't forget the big heads too.