The report was made to gardaí after regular withdrawals from the man’s financial accounts were noticed by a relative.
Gardaí have confirmed they have received the report and are currently “assessing it”.
It is one of several cases of financial abuse among elderly people across the country, according to Age Action.
The organisation cited another elderly person who lives alone and has memory loss. Her two daughters are acting powers of attorney for her.
According to Age Action, one daughter has discovered that her sister has been taking substantial sums of money from the mother’s bank account.
The money continued to be taken even after the culprit was confronted by her sister.
The case has been referred to the HSE safeguarding team in her area.
The Age Action spokeswoman also listed a case in which an elderly man was taken to the bank by his son, to unwillingly withdraw money from his account.