diff -r 4ad4c1cf673a -r 971b77c0cbc4 src/pyams_content/locales/pyams_content.pot
--- a/src/pyams_content/locales/pyams_content.pot	Fri Jan 18 15:31:28 2019 +0100
+++ b/src/pyams_content/locales/pyams_content.pot	Fri Jan 18 15:42:19 2019 +0100
@@ -6,7 +6,7 @@
 msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE 1.0\n"
-"POT-Creation-Date: 2019-01-17 16:40+0100\n"
+"POT-Creation-Date: 2019-01-17 18:03+0100\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -149,7 +149,7 @@
 #: ./src/pyams_content/component/paragraph/interfaces/audio.py:46
 #: ./src/pyams_content/component/paragraph/interfaces/verbatim.py:44
 #: ./src/pyams_content/component/video/interfaces.py:42
-#: ./src/pyams_content/shared/resource/interfaces.py:64
+#: ./src/pyams_content/shared/resource/interfaces.py:66
 msgid "Author"
 msgstr ""
 
@@ -3477,111 +3477,127 @@
 msgid "Manager will have access to contents owned by these principals"
 msgstr ""
 
-#: ./src/pyams_content/shared/resource/interfaces.py:29
+#: ./src/pyams_content/shared/resource/schema.py:26
+msgid "Minimum age"
+msgstr ""
+
+#: ./src/pyams_content/shared/resource/schema.py:29
+msgid "Maximum age"
+msgstr ""
+
+#: ./src/pyams_content/shared/resource/interfaces.py:31
 msgid "Resource"
 msgstr ""
 
-#: ./src/pyams_content/shared/resource/interfaces.py:58
+#: ./src/pyams_content/shared/resource/interfaces.py:60
 msgid "Original country"
 msgstr ""
 
-#: ./src/pyams_content/shared/resource/interfaces.py:61
+#: ./src/pyams_content/shared/resource/interfaces.py:63
 msgid "Original title"
 msgstr ""
 
-#: ./src/pyams_content/shared/resource/interfaces.py:67
+#: ./src/pyams_content/shared/resource/interfaces.py:69
 msgid "Translator"
 msgstr ""
 
-#: ./src/pyams_content/shared/resource/interfaces.py:70
+#: ./src/pyams_content/shared/resource/interfaces.py:72
 msgid "Illustrator"
 msgstr ""
 
-#: ./src/pyams_content/shared/resource/interfaces.py:73
+#: ./src/pyams_content/shared/resource/interfaces.py:75
 msgid "Drawer"
 msgstr ""
 
-#: ./src/pyams_content/shared/resource/interfaces.py:76
+#: ./src/pyams_content/shared/resource/interfaces.py:78
 msgid "Colourist"
 msgstr ""
 
-#: ./src/pyams_content/shared/resource/interfaces.py:79
+#: ./src/pyams_content/shared/resource/interfaces.py:81
 msgid "Lettering"
 msgstr ""
 
-#: ./src/pyams_content/shared/resource/interfaces.py:82
+#: ./src/pyams_content/shared/resource/interfaces.py:84
 msgid "Producer"
 msgstr ""
 
-#: ./src/pyams_content/shared/resource/interfaces.py:85
+#: ./src/pyams_content/shared/resource/interfaces.py:87
 msgid "Director"
 msgstr ""
 
-#: ./src/pyams_content/shared/resource/interfaces.py:88
+#: ./src/pyams_content/shared/resource/interfaces.py:90
 msgid "Actors"
 msgstr ""
 
-#: ./src/pyams_content/shared/resource/interfaces.py:91
+#: ./src/pyams_content/shared/resource/interfaces.py:93
 msgid "Editor"
 msgstr ""
 
-#: ./src/pyams_content/shared/resource/interfaces.py:94
+#: ./src/pyams_content/shared/resource/interfaces.py:96
 msgid "Collection"
 msgstr ""
 
-#: ./src/pyams_content/shared/resource/interfaces.py:97
+#: ./src/pyams_content/shared/resource/interfaces.py:99
 msgid "Series"
 msgstr ""
 
-#: ./src/pyams_content/shared/resource/interfaces.py:100
+#: ./src/pyams_content/shared/resource/interfaces.py:102
 msgid "Volume"
 msgstr ""
 
-#: ./src/pyams_content/shared/resource/interfaces.py:103
+#: ./src/pyams_content/shared/resource/interfaces.py:105
 msgid "Format"
 msgstr ""
 
-#: ./src/pyams_content/shared/resource/interfaces.py:106
+#: ./src/pyams_content/shared/resource/interfaces.py:108
 msgid "Nb pages"
 msgstr ""
 
-#: ./src/pyams_content/shared/resource/interfaces.py:110
+#: ./src/pyams_content/shared/resource/interfaces.py:112
+msgid "Duration"
+msgstr ""
+
+#: ./src/pyams_content/shared/resource/interfaces.py:115
+msgid "Age range"
+msgstr ""
+
+#: ./src/pyams_content/shared/resource/interfaces.py:118
 msgid "Release year"
 msgstr ""
 
-#: ./src/pyams_content/shared/resource/interfaces.py:114
+#: ./src/pyams_content/shared/resource/interfaces.py:122
 msgid "Awards"
 msgstr ""
 
-#: ./src/pyams_content/shared/resource/interfaces.py:117
+#: ./src/pyams_content/shared/resource/interfaces.py:125
 msgid "Editor reference"
 msgstr ""
 
-#: ./src/pyams_content/shared/resource/interfaces.py:120
-msgid "ISBN number"
-msgstr ""
-
-#: ./src/pyams_content/shared/resource/interfaces.py:123
-msgid "Price"
-msgstr ""
-
-#: ./src/pyams_content/shared/resource/interfaces.py:127
-msgid "Source URI"
-msgstr ""
-
 #: ./src/pyams_content/shared/resource/interfaces.py:128
-msgid "External URL used to get more information about resource"
+msgid "ISBN number"
 msgstr ""
 
 #: ./src/pyams_content/shared/resource/interfaces.py:131
+msgid "Price"
+msgstr ""
+
+#: ./src/pyams_content/shared/resource/interfaces.py:135
+msgid "Source URI"
+msgstr ""
+
+#: ./src/pyams_content/shared/resource/interfaces.py:136
+msgid "External URL used to get more information about resource"
+msgstr ""
+
+#: ./src/pyams_content/shared/resource/interfaces.py:139
 msgid "Summary"
 msgstr ""
 
-#: ./src/pyams_content/shared/resource/interfaces.py:134
+#: ./src/pyams_content/shared/resource/interfaces.py:142
 msgid "Synopsis"
 msgstr ""
 
-#: ./src/pyams_content/shared/resource/interfaces.py:137
+#: ./src/pyams_content/shared/resource/interfaces.py:145
 msgid "Publisher's words"
 msgstr ""