"The reason Westpac gives is less over-the-counter transactions at the Waikanae branch.
"While we accept online usage is on the increase, we know that there is still a need for a branch presence, particularly in communities such as Waikanae.
"Waikanae has one of the largest populations of over 65-year-olds in the country. Waikanae branch has some visually impaired customers and some struggling with dementia that rely on their branch being open and their face-to-face service.
"We don't accept that a bank earning close to a billion in profit last year needs to close these branches."
A Westpac spokesperson said, "A proposal regarding a number of branches is currently with staff for their consideration and feedback. Once that feedback has been received and evaluated a decision will be made.
"Staff and customers will be the first to know that decision and there will be no further public comment until then."
Kapiti Coast Grey Power spokesman Kevin Burrows said: "Statistics show that more than 38 per cent of Waikanae's population is over the age of 65 and while we do not know how many of these people are Westpac customers, it would be reasonable to expect that it is a significant number.
"Demographic reports suggest that this figure of the over 65s will increase by nearly 50 per cent by 2031. A Ministry of Social Development survey shows that the use of computers drops off significantly after age 70 so online banking is not an option for many.
"The nearest Westpac for Waikanae residents will be in Paraparaumu and there is a marked reluctance for older drivers to travel between Waikanae and Paraparaumu. A branch in the local community is a necessity for older people.
"This move comes at a time when many businesses are vying for the Electra Age Friendly Business of the Year award.
"If the branch does close a great many older customers will be left with no alternative but to go to a bank that has a branch in Waikanae."