Register Plus – User-Defined Fields – problems with message user gets

IN REGISTER PLUS, (GREAT PLUGIN!) I’M TRYING TO CREATE A CUSTOM FIELD FOR THE REG-CONFIRMATION EMAIL MESSAGE NEW REGISTRANTS RECEIVE.

HERE’S BASICALLY WHAT I PUT IN THE USER MESSAGE WINDOW IN REG PLUS
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Your username is: %user_login% THIS WORKS FINE
Your password is: %user_pass% THIS WORKS FINE

Your age is: %descriptive_fieldlabel_here% PROBLEM

To finish registering, click this link: %siteurl% THIS WORKS FINE
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HERE’S BASICALLY THE EMAIL MESSAGE THE USER RECEIVES
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Your username is: MarySmith
Your password is: UserzPassword

Your age is: descriptive_fieldlabel_here

To finish registering, click this link: THIS WORKS FINE
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SO, I HOPE THAT SHOWS THE PROBLEM: THE MESSAGE THE USER GETS DISPLAYS THE TEXT BETWEEN THE TWO %s. ISN’T IT SUPPOSED TO DISPLAY THE TEXT THE USER PUTS IN THE CUSTOM FIELD ON THE REG FORM? AS IT DOES WITH THE USERNAME AND PASSWORD?

HERE’S BASICALLY WHAT I DID WITH THE CUSTOM FIELD SECTION OF REG PLUS:

Custom Field, Extra Options field #1: descriptive_fieldlabel_here
Custom Field, Extra Options field #2: How old are you?
Drop-down = Text Field
Add Registration Field = Checkmarked

WHAT AM I DOING WRONG?