BFSO Bulletin 56
(pdf) contains some excellent resources on elder financial abuse
focussing on the role that banks and other financial institutions can
play.

The purpose of the Bulletin is to provide information about
financial abuse and how to identify it – to assist in raising awareness
of the issue and to highlight some warning signs – and to put that
information in the context of the interaction between banks and other
financial institutions and their older customers.

It draws on the findings of Older People and the Law,
a Report of the House of Representatives Standing Committee on Legal
and Constitutional Affairs following its Inquiry into Older People and
the Law.