diff --git a/dav_registration/forms.py b/dav_registration/forms.py
index e80d9e3..da93756 100644
--- a/dav_registration/forms.py
+++ b/dav_registration/forms.py
@@ -1,4 +1,5 @@
 # -*- coding: utf-8 -*-
+import datetime
 import logging
 from django import forms
 from django.utils.translation import ugettext, ugettext_lazy as _
@@ -25,6 +26,28 @@ class RegistrationForm(forms.ModelForm):
             'note': forms.Textarea(attrs={'rows': 5}),
         }
 
+    def clean_year_of_birth(self):
+        now = datetime.datetime.now()
+        year_now = now.year
+        max_age = 100
+        val = self.cleaned_data.get('year_of_birth')
+        if val > year_now:
+            raise forms.ValidationError(
+                ugettext(u'Dein Geburtsjahr liegt in der Zukunft?'
+                         u' Das finden wir gut,'
+                         u' aber bitte melde dich besser mal per E-Mail bei uns.'),
+                code='to_young',
+            )
+        elif val < (year_now - max_age):
+            raise forms.ValidationError(
+                ugettext(u'Du bist schon über %(max_age)d Jahre alt?'
+                         u' Das finden wir gut,'
+                         u' aber bitte melde dich besser mal per E-Mail bei uns.'),
+                params={'max_age': max_age},
+                code='to_old',
+            )
+        return val
+
     def clean_experience(self):
         val = self.cleaned_data.get('experience')
         if val == '':
diff --git a/dav_registration/migrations/0009_registration_year_of_birth.py b/dav_registration/migrations/0009_registration_year_of_birth.py
new file mode 100644
index 0000000..455a614
--- /dev/null
+++ b/dav_registration/migrations/0009_registration_year_of_birth.py
@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.29 on 2020-12-09 09:20
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('dav_registration', '0008_auto_20201208_1906'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='registration',
+            name='year_of_birth',
+            field=models.IntegerField(default=1870, help_text='Manchmal müssen wir wissen, wie alt unsere Teilnehmer sind. Darum brauchen wir die vierstellige Jahreszahl, des Jahres in dem du geboren bist (zb. 1991).', verbose_name='Geburtsjahr'),
+            preserve_default=False,
+        ),
+    ]
diff --git a/dav_registration/models.py b/dav_registration/models.py
index 62737ef..c864e6a 100644
--- a/dav_registration/models.py
+++ b/dav_registration/models.py
@@ -40,6 +40,12 @@ class Registration(models.Model):
     phone_number = models.CharField(max_length=254,
                                     verbose_name=_('Telefonnummer'),
                                     help_text=_('Idealerweise eine Mobilfunk-Nummer'))
+
+    year_of_birth = models.IntegerField(verbose_name=_('Geburtsjahr'),
+                                        help_text=_('Manchmal müssen wir wissen, wie alt unsere Teilnehmer sind.'
+                                                    ' Darum brauchen wir die vierstellige Jahreszahl,'
+                                                    ' des Jahres in dem du geboren bist (zb. 1991).'))
+
     dav_member = models.BooleanField(default=True,
                                      verbose_name=_('DAV Mitglied'))
     dav_number = models.CharField(max_length=62,
@@ -74,6 +80,11 @@ class Registration(models.Model):
 
     answered_obsolete = models.BooleanField(default=False, verbose_name=_('Durch Tourleitung beantwortet'))
 
+    def approx_age(self):
+        now = datetime.datetime.now()
+        year_now = now.year
+        return year_now - self.year_of_birth
+
     @staticmethod
     def pk2hexstr(pk):
         return hex(pk * 113)[2:]  # 113 has no meaning, but it produce nice looking hex codes.
@@ -113,6 +124,7 @@ class Registration(models.Model):
 {address}, {postal_code} {city}
 
 DAV Mitglied: {dav_info}
+Jahrgang: {year_of_birth} (ungefähres Alter: {approx_age})
 
 Erfahrung:
 {experience}
@@ -131,6 +143,8 @@ Anmerkung:
             postal_code=self.postal_code,
             city=self.city,
             dav_info=dav_info,
+            year_of_birth=self.year_of_birth,
+            approx_age=self.approx_age(),
             experience=self.experience,
             note=self.note,
         )
diff --git a/dav_registration/templates/dav_registration/emails/inform_self.txt b/dav_registration/templates/dav_registration/emails/inform_self.txt
index dfdbfeb..ca5925e 100644
--- a/dav_registration/templates/dav_registration/emails/inform_self.txt
+++ b/dav_registration/templates/dav_registration/emails/inform_self.txt
@@ -22,6 +22,7 @@ Personendaten
 {{ registration.postal_code }} {{ registration.city }}
 Telefon: {{ registration.phone_number }}
 E-Mail: {{ registration.email_address }}
+Jahrgang: {{ registration.year_of_birth }}
 {% if registration.dav_member %}DAV Mitgliedsnummer: {{ registration.dav_number }}{% else %}DAV Mitglied: Nein{% endif %}
 
 Notfall-Kontakt
diff --git a/dav_registration/templates/dav_registration/emails/inform_trainer.txt b/dav_registration/templates/dav_registration/emails/inform_trainer.txt
index 5da7483..7edd9b3 100644
--- a/dav_registration/templates/dav_registration/emails/inform_trainer.txt
+++ b/dav_registration/templates/dav_registration/emails/inform_trainer.txt
@@ -19,6 +19,8 @@ Notfall-Kontakt:
 Erfahrung:
 {% if registration.experience %}{{ registration.experience }}{% else %}-{% endif %}
 
+Jahrgang: {{ registration.year_of_birth }} (ungefähres Alter: {{ registration.approx_age }})
+
 Anmerkung:
 {% if registration.note %}{{ registration.note }}{% else %}-{% endif %}
 
diff --git a/dav_registration/templates/dav_registration/registration_form.html b/dav_registration/templates/dav_registration/registration_form.html
index 473e213..322efb6 100644
--- a/dav_registration/templates/dav_registration/registration_form.html
+++ b/dav_registration/templates/dav_registration/registration_form.html
@@ -90,12 +90,21 @@
         </div>
     </div>
     <div class="row">
+        <div class="col-sm-3">
+            {% bootstrap_field form.year_of_birth %}
+        </div>
         <div class="col-sm-3">
             {% bootstrap_field form.dav_number %}
         </div>
         <div class="col-sm-3">
+            <strong>Nichtmitglieder</strong>
             {% bootstrap_field form.not_dav_member %}
         </div>
+    </div>
+    <div class="row">
+        <div class="col-sm-6">
+            <span class="hidden">Antrag auf reduzierten Teilnehmerbeitrag</span>
+        </div>
         <div class="col-sm-6">
             {% bootstrap_field form.emergency_contact %}
         </div>