diff --git a/app/models/verification/residence.rb b/app/models/verification/residence.rb
index e07b88897..57bafa9a4 100644
--- a/app/models/verification/residence.rb
+++ b/app/models/verification/residence.rb
@@ -12,14 +12,15 @@ class Verification::Residence
 
   validates :postal_code, length: { is: 5 }
 
-  validate :residence_in_madrid
+  validate :allowed_age
   validate :document_number_uniqueness
+  validate :residence_in_madrid
 
   def initialize(attrs={})
     self.date_of_birth = parse_date('date_of_birth', attrs)
     attrs = remove_date('date_of_birth', attrs)
     super
-    self.document_number.upcase! unless self.document_number.blank?
+    clean_document_number
   end
 
   def save
@@ -30,7 +31,7 @@ class Verification::Residence
   end
 
   def document_number_uniqueness
-    errors.add(:document_number, "Already in use") if User.where(document_number: document_number).any?
+    errors.add(:document_number, I18n.t('errors.messages.taken')) if User.where(document_number: document_number).any?
   end
 
   def residence_in_madrid
@@ -47,6 +48,11 @@ class Verification::Residence
     self.date_of_birth = string_to_date(date_of_birth)
   end
 
+  def allowed_age
+    return if errors[:date_of_birth].any?
+    errors.add(:date_of_birth, I18n.t('verification.residence.new.error_not_allowed_age')) unless self.date_of_birth <= 16.years.ago
+  end
+
   def store_failed_attempt
     FailedCensusCall.create({
       user: user,
@@ -57,4 +63,10 @@ class Verification::Residence
     })
   end
 
+  private
+
+    def clean_document_number
+      self.document_number = self.document_number.gsub(/[^a-z0-9]+/i, "").upcase unless self.document_number.blank?
+    end
+
 end
diff --git a/config/i18n-tasks.yml b/config/i18n-tasks.yml
index 7c67a3a09..4021dcac6 100644
--- a/config/i18n-tasks.yml
+++ b/config/i18n-tasks.yml
@@ -94,6 +94,7 @@ search:
 ignore_missing:
   - 'unauthorized.*'
   - 'errors.messages.blank'
+  - 'errors.messages.taken'
 
 ## Consider these keys used:
 ignore_unused:
diff --git a/config/locales/verification.en.yml b/config/locales/verification.en.yml
index 267138b5b..14668aad5 100644
--- a/config/locales/verification.en.yml
+++ b/config/locales/verification.en.yml
@@ -22,6 +22,7 @@ en:
         verify_residence: "Verify residence"
         form_errors: "prevented your residence verification"
         error_verifying_census: "The census of the city of Madrid could not verify your information. Pero revise de information and try again or get in touch with us."
+        error_not_allowed_age: "You need yo be at least 16 years old"
       create:
         flash:
           success: "Residence verified"
diff --git a/config/locales/verification.es.yml b/config/locales/verification.es.yml
index af2deb59a..95296f7ef 100644
--- a/config/locales/verification.es.yml
+++ b/config/locales/verification.es.yml
@@ -22,6 +22,7 @@ es:
         verify_residence: "Verificar residencia"
         form_errors: "evitaron verificar tu residencia"
         error_verifying_census: "El Padrón de Madrid no pudo verificar tu información. Revisa la información ó ponte en contacto con nosotros."
+        error_not_allowed_age: "Hay que tener al menos 16 años"
       create:
         flash:
           success: "Residencia verificada"
diff --git a/spec/models/residence_spec.rb b/spec/models/residence_spec.rb
index cb1f91ae0..1d623186e 100644
--- a/spec/models/residence_spec.rb
+++ b/spec/models/residence_spec.rb
@@ -18,11 +18,17 @@ describe Verification::Residence do
 
       it "should not be valid without a date of birth" do
         residence = Verification::Residence.new({"date_of_birth(3i)"=>"", "date_of_birth(2i)"=>"", "date_of_birth(1i)"=>""})
-        residence.valid?
+        expect(residence).to_not be_valid
         expect(residence.errors[:date_of_birth]).to include("can't be blank")
       end
     end
 
+    it "should validate user has allowed age" do
+        residence = Verification::Residence.new({"date_of_birth(3i)"=>"1", "date_of_birth(2i)"=>"1", "date_of_birth(1i)"=>"#{5.year.ago.year}"})
+        expect(residence).to_not be_valid
+        expect(residence.errors[:date_of_birth]).to include("You need yo be at least 16 years old")
+    end
+
     it "should validate uniquness of document_number" do
       user = create(:user)
       residence.user = user
@@ -31,13 +37,14 @@ describe Verification::Residence do
       residence2 = build(:verification_residence)
 
       residence.valid?
-      expect(residence.errors[:document_number]).to include("Already in use")
+      expect(residence.errors[:document_number]).to include("has already been taken")
     end
 
     it "should validate census terms" do
       residence.terms_of_service = nil
       expect(residence).to_not be_valid
     end
+
   end
 
   describe "new" do
@@ -45,6 +52,11 @@ describe Verification::Residence do
       residence = Verification::Residence.new({document_number: "x1234567z"})
       expect(residence.document_number).to eq("X1234567Z")
     end
+
+    it "should remove all characters except numbers and letters" do
+      residence = Verification::Residence.new({document_number: " 12.345.678 - B"})
+      expect(residence.document_number).to eq("12345678B")
+    end
   end
 
   describe "save" do