Fix copy/paste error.

ticdesk_account/forms.py

@@ -34,7 +34,7 @@ def is_date_min_years_ago(min_years):
     def _the_validator(dt):
         delta = date.today() - dt
         years = int(delta.days / 365.2425)
-        if self.date_of_birth > today - relativedelta(years=years):
+        if dt > today - relativedelta(years=years):
             years -= 1
         if years < min_years:
             raise forms.ValidationError(_('Du musst mindestens %d Jahre alt sein! Hast du vielleicht dein Geburtsdatum falsch angegeben?') % min_years)