@@ -, +, @@ 
 to have guarantees
---
 Koha/Patron.pm                |  4 ++--
 t/db_dependent/Koha/Patrons.t | 17 ++++++++++++++++-
 2 files changed, 18 insertions(+), 3 deletions(-)
--- a/Koha/Patron.pm	
+++ a/Koha/Patron.pm	
@@ -1982,13 +1982,13 @@ sub is_superlibrarian {
 
 my $is_adult = $patron->is_adult
 
-Return true if the patron has a category with a type Adult (A) or Organization (I)
+Return true if the patron has a category with a type Adult (A), Organization (I) or Staff (S)
 
 =cut
 
 sub is_adult {
     my ( $self ) = @_;
-    return $self->category->category_type =~ /^(A|I)$/ ? 1 : 0;
+    return $self->category->category_type =~ /^(A|I|S)$/ ? 1 : 0;
 }
 
 =head3 is_child
--- a/t/db_dependent/Koha/Patrons.t	
+++ a/t/db_dependent/Koha/Patrons.t	
@@ -1414,7 +1414,7 @@ subtest 'account_locked' => sub {
 };
 
 subtest 'is_child | is_adult' => sub {
-    plan tests => 8;
+    plan tests => 10;
     my $category = $builder->build_object(
         {
             class => 'Koha::Patron::Categories',
@@ -1463,21 +1463,36 @@ subtest 'is_child | is_adult' => sub {
             value => { categorycode => $category->categorycode }
         }
     );
+    $category = $builder->build_object(
+        {
+           class => 'Koha::Patron::Categories',
+           value => { category_type => 'S' }
+        }
+    );
+    my $patron_staff = $builder->build_object(
+        {
+           class => 'Koha::Patrons',
+           value => { categorycode => $category->categorycode }
+        }
+    );
     is( $patron_adult->is_adult, 1, 'Patron from category A should be considered adult' );
     is( $patron_adult_i->is_adult, 1, 'Patron from category I should be considered adult' );
     is( $patron_child->is_adult, 0, 'Patron from category C should not be considered adult' );
     is( $patron_other->is_adult, 0, 'Patron from category O should not be considered adult' );
+    is( $patron_staff->is_adult, 1, 'Patron from category S should be considered adult' );
 
     is( $patron_adult->is_child, 0, 'Patron from category A should be considered child' );
     is( $patron_adult_i->is_child, 0, 'Patron from category I should be considered child' );
     is( $patron_child->is_child, 1, 'Patron from category C should not be considered child' );
     is( $patron_other->is_child, 0, 'Patron from category O should not be considered child' );
+    is( $patron_staff->is_child, 0, 'Patron from category S should not be considered child' );
 
     # Clean up
     $patron_adult->delete;
     $patron_adult_i->delete;
     $patron_child->delete;
     $patron_other->delete;
+    $patron_staff->delete;
 };
 
 subtest 'overdues' => sub {
--