diff --git a/app/views/api/notifications/_notify_user_when_child_age_will_be_18.json.jbuilder b/app/views/api/notifications/_notify_user_when_child_age_will_be_18.json.jbuilder
new file mode 100644
index 000000000..348b47f06
--- /dev/null
+++ b/app/views/api/notifications/_notify_user_when_child_age_will_be_18.json.jbuilder
@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+json.title notification.notification_type
+json.description t('.child_age_will_be_18_years_ago',
+                   NAME: notification.attached_object.full_name,
+                   DATE: I18n.l(notification.attached_object.birthday, format: :default))
diff --git a/app/views/notifications_mailer/notify_user_when_child_age_will_be_18.html.erb b/app/views/notifications_mailer/notify_user_when_child_age_will_be_18.html.erb
new file mode 100644
index 000000000..cb845ff68
--- /dev/null
+++ b/app/views/notifications_mailer/notify_user_when_child_age_will_be_18.html.erb
@@ -0,0 +1,6 @@
+<%= render 'notifications_mailer/shared/hello', recipient: @recipient %>
+
+<%= t('.body.child_age_will_be_18_years_ago', **{
+  NAME: @attached_object.full_name,
+  DATE: I18n.l(@attached_object.birthday, format: :default),
+}) %>
diff --git a/app/workers/child_age_worker.rb b/app/workers/child_age_worker.rb
new file mode 100644
index 000000000..374b451bf
--- /dev/null
+++ b/app/workers/child_age_worker.rb
@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+# send a notification if child age > 18 years ago
+class ChildAgeWorker
+  include Sidekiq::Worker
+
+  def perform
+    children = Child.where('birthday = ?', 18.years.ago + 2.days)
+    children.each do |child|
+      NotificationCenter.call type: 'notify_user_when_child_age_will_be_18',
+                              receiver: child.user,
+                              attached_object: child
+    end
+  end
+end
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 3673dd092..92c110377 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -481,6 +481,8 @@ en:
         your_reservation_RESERVABLE_was_invalidated_html: "Your pre-registration of <strong><em>%{RESERVABLE}</em></strong> wasn't validated."
       notify_admin_reservation_invalidated:
         a_RESERVABLE_reservation_was_invalidated_html: "A <strong><em>%{RESERVABLE}</em></strong> pre-registration of <strong><em>%{USER}</em></strong> was invalidated."
+      notify_user_when_child_age_will_be_18:
+        child_age_will_be_18_years_ago: "Your child %{NAME} will turn 18 on %{DATE}, at which point they will be automatically detached from your Family account. They will need to create their own account in order to make reservations."
   #statistics tools for admins
   statistics:
     subscriptions: "Subscriptions"
diff --git a/config/locales/fr.yml b/config/locales/fr.yml
index ff6506e9f..d94ecc30f 100644
--- a/config/locales/fr.yml
+++ b/config/locales/fr.yml
@@ -481,6 +481,8 @@ fr:
         your_reservation_RESERVABLE_was_invalidated_html: "Votre demande de pré-inscription de <strong><em>%{RESERVABLE}</em></strong> n'a pas été validée."
       notify_admin_reservation_invalidated:
         a_RESERVABLE_reservation_was_invalidated_html: "La réservation de <strong><em>%{RESERVABLE}</em></strong> de <strong><em>%{NAME}</em></strong> a été invalidée."
+      notify_user_when_child_age_will_be_18:
+        child_age_will_be_18_years_ago: "Votre enfant %{NAME} va avoir 18ans, le %{DATE}, date à laquelle il sera automatiquement détaché de votre compte Famille. Il devra se créer son propre compte pour effectuer ses réservations."
   #statistics tools for admins
   statistics:
     subscriptions: "Abonnements"
diff --git a/config/locales/mails.en.yml b/config/locales/mails.en.yml
index c3c927dc9..20f6bc39d 100644
--- a/config/locales/mails.en.yml
+++ b/config/locales/mails.en.yml
@@ -479,3 +479,7 @@ en:
       subject: "Pre-registration wasn't validated"
       body:
         reservation_invalidated_html: "<strong><em>%{RESERVABLE}</em></strong> of %{NAME} wasn't validated."
+    notify_user_when_child_age_will_be_18:
+      subject: "Your child will be 18 years old"
+      body:
+        child_age_will_be_18_years_ago: "Your child %{NAME} will turn 18 on %{DATE}, at which point they will be automatically detached from your Family account. They will need to create their own account in order to make reservations."
diff --git a/config/locales/mails.fr.yml b/config/locales/mails.fr.yml
index 232c48669..a6cda1010 100644
--- a/config/locales/mails.fr.yml
+++ b/config/locales/mails.fr.yml
@@ -479,3 +479,7 @@ fr:
       subject: "Demande of pré-inscription n'a pas été validée"
       body:
         reservation_invalidated_html: "<strong><em>%{RESERVABLE}</em></strong> du membre %{NAME} n'a pas été validée."
+    notify_user_when_child_age_will_be_18:
+      subject: "Votre enfant va avoir 18ans"
+      body:
+        child_age_will_be_18_years_ago: "Votre enfant %{NAME} va avoir 18ans, le %{DATE}, date à laquelle il sera automatiquement détaché de votre compte Famille. Il devra se créer son propre compte pour effectuer ses réservations."
diff --git a/config/schedule.yml b/config/schedule.yml
index 31e0c7f81..93b45c9e9 100644
--- a/config/schedule.yml
+++ b/config/schedule.yml
@@ -62,4 +62,9 @@ auto_cancel_authorizations:
   class: TrainingAuthorizationWorker
   queue: default
 
+child_age_will_be_18:
+  cron: "0 0 0 * * *" # every day, at midnight
+  class: ChildAgeWorker
+  queue: default
+
 <%= PluginRegistry.insert_code('yml.schedule') %>
diff --git a/db/seeds/notification_types.rb b/db/seeds/notification_types.rb
index 1f768bb60..582b4a030 100644
--- a/db/seeds/notification_types.rb
+++ b/db/seeds/notification_types.rb
@@ -94,7 +94,8 @@ NOTIFICATIONS_TYPES = [
   { name: 'notify_member_pre_booked_reservation', category: 'agenda', is_configurable: false },
   { name: 'notify_admin_member_pre_booked_reservation', category: 'agenda', is_configurable: true },
   { name: 'notify_member_reservation_invalidated', category: 'agenda', is_configurable: false },
-  { name: 'notify_admin_reservation_invalidated', category: 'agenda', is_configurable: true }
+  { name: 'notify_admin_reservation_invalidated', category: 'agenda', is_configurable: true },
+  { name: 'notify_user_when_child_age_will_be_18', category: 'users_accounts', is_configurable: false },
 ].freeze
 
 NOTIFICATIONS_TYPES.each do |notification_type|