Fixes #2806

app/templates/teachers-free-trial.jade

@@ -58,7 +58,7 @@ block content
         input(type="radio", name="age", value="18+")
         span.spl 18+
       div
-        input(type="radio", name="age", value='other')
+        input.radio-other(type="radio", name="age", value='other')
         span.spl.spr(data-i18n="teachers_survey.other")
         input.spr.input-age-other(type='text')
     p.container-num-students

app/views/TeachersFreeTrialView.coffee

@@ -11,6 +11,7 @@ module.exports = class TeachersFreeTrialView extends RootView
 
   events:
     'click .submit-button': 'onClickSubmit'
+    'click .input-age-other': 'onClickTextBox'
 
   constructor: (options) ->
     super options
@@ -32,6 +33,9 @@ module.exports = class TeachersFreeTrialView extends RootView
       @render?()
     @supermodel.loadCollection(@existingRequests, 'own_trial_requests', {cache: false})
 
+  onClickTextBox: (e) ->
+    $('.radio-other').prop("checked", true)
+
   onClickSubmit: (e) ->
     email = $('.input-email-address').val()
     school = $('.input-school').val()