How to use subroutine from other module?

[lelikflegma]

I need to use subroutine

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CustomerAge

from package

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package Kernel::Output::HTML::Layout;

in package

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package Kernel::System::Ticket;

to make ticket field Age human readable (like X h X m).

I tried to write in ticket.pm :

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use Kernel::Output::HTML::Layout;
sub new {
...
$Self->{LayoutObject}    = Kernel::Output::HTML::Layout->new( %{$Self} );
}

but i got error:
Can't call method "Get" on an undefined value at /opt/otrs//Kernel/Output/HTML/Layout.pm line 1379.