diff --git a/leads/models.py b/leads/models.py
index b39843c..bd2b6a0 100644
--- a/leads/models.py
+++ b/leads/models.py
@@ -23,7 +23,7 @@ def get_queryset(self):
 class Lead(models.Model):
     first_name = models.CharField(max_length=20)
     last_name = models.CharField(max_length=20)
-    age = models.IntegerField(default=0)
+    age = models.PositiveSmallIntegerField(null=True)
     organisation = models.ForeignKey(UserProfile, on_delete=models.CASCADE)
     agent = models.ForeignKey("Agent", null=True, blank=True, on_delete=models.SET_NULL)
     category = models.ForeignKey("Category", related_name="leads", null=True, blank=True, on_delete=models.SET_NULL)
@@ -75,4 +75,4 @@ def post_user_created_signal(sender, instance, created, **kwargs):
         UserProfile.objects.create(user=instance)
 
 
-post_save.connect(post_user_created_signal, sender=User)
\ No newline at end of file
+post_save.connect(post_user_created_signal, sender=User)