Age property in penguin data model

houdini/data/penguin.py

@@ -1,3 +1,5 @@
+from datetime import datetime
+
 from houdini.data import db
 
 from houdini.data.permission import PermissionCrumbsCollection
@@ -103,6 +105,10 @@ class Penguin(db.Model):
     def safe_nickname(self, language_bitmask):
         return self.nickname if self.approval & language_bitmask else "P" + str(self.id)
 
+    @property
+    def age(self):
+        return (datetime.now() - self.registration_date).days
+
     @property
     def approval(self):
         return int('{}{}0{}{}{}{}'.format(self.approval_ru * 1, self.approval_de * 1, self.approval_es * 1,