The 15th June has been designated by the United Nations as World Elder Abuse awarenes day to increase knowledge and work to eliminate abuse and violence against older people worldwide.
in 2017 the theme is Violence against older persons, a human rights issue
The official UN page has related messages and resolutions
Some sources for investigating the nature and extent of violence against older people include:
HelpAge international has some shocking statistics and is calling for a convention against elder violence.
it cites evidence from a number of surveys of reports of violence against older people.
The World Health Organization also has a factsheet updated in June 2017 on elder abuse. It quotes the shocking statistics that "Around 1 in 6 older people experienced some form of abuse in the past year"
Large numbers of older women suffer abuse.
University of Durham research on sexual violence against older women
Indexes for tracing journal articles and reports
These resources offer abstracts and in some cases links to full text reports on age related topics.